PySTAC is a library for working with SpatioTemporal Asset Catalogs (STACs)
Returns the STAC version PySTAC writes as the “stac_version” property for any object it serializes into JSON.
If a call to set_stac_version was made, this will return the value it was called with. Next it will check the environment for a PYSTAC_STAC_VERSION_OVERRIDE variable. Otherwise it will return the latest STAC version that this version of PySTAC supports.
The STAC Version PySTAC is set up to use.
Reads a STACObject or ItemCollection from a JSON-like dict representing a serialized STAC object.
This method will return either a Catalog, Collection, or :class`~Item` based on the contents of the dict.
This is a convenience method for either StacIO.stac_object_from_dict.
d – The dict to parse.
href – Optional href that is the file location of the object being parsed.
root – Optional root of the catalog for this object. If provided, the root’s resolved object cache can be used to search for previously resolved instances of the STAC object.
stac_io – Optional StacIO instance to use for reading. If None, the default instance will be used.
STACTypeError – If the d dictionary does not represent a valid STACObject. Note that an ItemCollection is not a STACObject and must be read using ItemCollection.from_dict
Reads a STAC object from a file.
This method will return either a Catalog, a Collection, or an Item based on what the file contains.
This is a convenience method for StacIO.read_stac_object
href – The HREF to read the object from.
stac_io – Optional StacIO instance to use for I/O operations. If not provided, will use StacIO.default() to create an instance.
The specific STACObject implementation class that is represented by the JSON read from the file located at HREF.
STACTypeError – If the file at href does not represent a valid STACObject. Note that an ItemCollection is not a STACObject and must be read using ItemCollection.from_file
Sets the STAC version that PySTAC should use.
This is the version that will be set as the “stac_version” property on any JSON STAC objects written by PySTAC. If set to None, the override version will be cleared if previously set and the default or an override taken from the environment will be used.
You can also set the environment variable PYSTAC_STAC_VERSION_OVERRIDE to override the version.
stac_version – The STAC version to use instead of the latest STAC version that PySTAC supports (described in STACVersion.DEFAULT_STAC_VERSION). If None, clear to use the default for this version of PySTAC.
Note
Setting the STAC version to something besides the default version will not effect the format of STAC read or written; it will only override the stac_version property of the objects being written. Setting this incorrectly can produce invalid STAC.
Writes a STACObject to a file.
This will write only the Catalog, Collection or Item obj. It will not attempt to write any other objects that are linked to obj; if you’d like functionality to save off catalogs recursively see Catalog.save.
This method will write the JSON of the object to the object’s assigned “self” link or to the dest_href if provided. To set the self link, see STACObject.set_self_href.
Convenience method for STACObject.from_file
obj – The STACObject to save.
include_self_link – If True, include the "self" link with this object. Otherwise, leave out the self link.
dest_href – Optional HREF to save the file to. If None, the object will be saved to the object’s "self" href.
stac_io – Optional StacIO instance to use for I/O operations. If not provided, will use StacIO.default() to create an instance.
A base class for other PySTAC classes that contains a variety of useful methods for dealing with links, copying objects, accessing extensions, and reading and writing files. You shouldn’t use STACObject directly, but instead access this functionality through the implementing classes.
Add a link to this object’s set of links.
link – The link to add.
Add links to this object’s set of links.
links – The links to add.
Clears all Link instances associated with this object.
rel – If set, only clear links that match this relationship.
Clones this object.
Cloning an object will make a copy of all properties and links of the object; however, it will not make copies of the targets of links (i.e. it is not a deep copy). To copy a STACObject fully, with all linked elements also copied, use full_copy().
The clone of this object.
Parses this STACObject from the passed in dictionary.
d – The dict to parse.
href – Optional href that is the file location of the object being parsed.
root – Optional root catalog for this object. If provided, the root of the returned STACObject will be set to this parameter.
migrate – By default, STAC objects and extensions are migrated to their latest supported version. Set this to False to disable this behavior.
preserve_dict – If False, the dict parameter d may be modified during this method call. Otherwise the dict is not mutated. Defaults to True, which results results in a deepcopy of the parameter. Set to False when possible to avoid the performance hit of a deepcopy.
The STACObject parsed from this dict.
Reads a STACObject implementation from a file.
href – The HREF to read the object from.
stac_io – Optional instance of StacIO to use. If not provided, will use the default instance.
The specific STACObject implementation class that is represented by the JSON read from the file located at HREF.
Create a full copy of this STAC object and any STAC objects linked to by this object.
root – Optional root to set as the root of the copied object, and any other copies that are contained by this object.
parent – Optional parent to set as the parent of the copy of this object.
links to.
Gets the Link instances associated with this object.
rel – If set, filter links such that only those matching this relationship are returned.
media_type – If set, filter the links such that only those matching media_type are returned. media_type can be a single value or a list of values.
rel and/
or media_type if set, or else all links associated with this object.
List[Link]
Get the Catalog or Collection to the parent for this object. The root is represented by a Link with rel == 'parent'.
The parent object for this object, or None if no root link is set.
Catalog, Collection, or None
Get the Catalog or Collection to the root for this object. The root is represented by a Link with rel == 'root'.
The root object for this object, or None if no root link is set.
Catalog, Collection, or None
Get the Link representing the root for this object.
The root link for this object, or None if no root link is set.
Link or None
Gets the absolute HREF that is represented by the rel == 'self' Link.
The absolute HREF of this object, or None if there is no self link defined.
str or None
Note
A self link can exist for objects, even if the link is not read or written to the JSON-serialized version of the object. Any object read from STACObject.from_file will have the HREF the file was read from set as it’s self HREF. All self links have absolute (as opposed to relative) HREFs.
Get a single Link instance associated with this object.
rel – If set, filter links such that only those matching this relationship are returned.
media_type – If set, filter the links such that only those matching media_type are returned. media_type can be a single value or a list of values.
rel
and/or media_type, or else the first link associated with this object.
Link | None
Gets the STACObject instances that are linked to by links with their rel property matching the passed in argument.
rel – The relation to match each Link’s rel property against.
typ – If not None, objects will only be yielded if they are instances of typ.
modify_links – A function that modifies the list of links before they are iterated over. For instance, this option can be used to sort the list so that links matching a particular pattern are earlier in the iterator.
connected to this object through links with the given rel and are of type typ (if given).
Iterable[STACObject]
The ID of the STAC Object.
A list of Link objects representing all links associated with this STAC Object.
Returns a boolean indicating whether the given dictionary represents a valid instance of this STACObject sub-class.
d – A dictionary to identify
Removes all hierarchical links from this object.
See pystac.link.HIERARCHICAL_LINKS for a list of all hierarchical links. If the object has a self href and add_canonical is True, a link with rel="canonical" is added.
add_canonical – If true, and this item has a self href, that href is used to build a canonical link.
All removed links
List[Link]
Remove links to this object’s set of links that match the given rel.
rel – The Link rel to match on.
Ensure all STACObjects linked to by this STACObject are resolved. This is important for operations such as changing HREFs.
This method mutates the entire catalog tree.
Saves this STACObject to it’s ‘self’ HREF.
include_self_link – If this is true, include the ‘self’ link with this object. Otherwise, leave out the self link.
dest_href – Optional HREF to save the file to. If None, the object will be saved to the object’s self href.
stac_io – Optional instance of StacIO to use. If not provided, will use the instance set on the object’s root if available, otherwise will use the default instance.
STACError – If no self href is set, this error will be raised.
Gets the absolute HREF that is represented by the rel == 'self' Link.
ValueError – If the self_href is not set, this method will throw a ValueError. Use get_self_href if there may not be an href set.
Sets the parent Catalog or Collection for this object.
parent – The parent object to set. Passing in None will clear the parent.
Sets the root Catalog or Collection for this object.
root – The root object to set. Passing in None will clear the root.
Sets the absolute HREF that is represented by the rel == 'self' Link.
href – The absolute HREF of this object. If the given HREF is not absolute, it will be transformed to an absolute HREF based on the current working directory. If this is None the call will clear the self HREF link.
A list of schema URIs for STAC Extensions implemented by this STAC Object.
Determine if target is somewhere in the hierarchical link tree of a STACObject.
target – A string or STACObject to search for
for the current STACObject
Returns this object as a dictionary.
include_self_link – If True, the dict will contain a self link to this object. If False, the self link will be omitted.
transform_hrefs – If True, transform the HREF of hierarchical links based on the type of catalog this object belongs to (if any). I.e. if this object belongs to a root catalog that is RELATIVE_PUBLISHED or SELF_CONTAINED, hierarchical link HREFs will be transformed to be relative to the catalog root.
dict – A serialization of the object.
Validate this STACObject.
Returns a list of validation results, which depends on the validation implementation. For JSON Schema validation (default validator), this will be a list of schema URIs that were used during validation.
validator – A custom validator to use for validation of the object. If omitted, the default validator from RegisteredValidator will be used instead.
An enumeration.
A PySTAC Catalog represents a STAC catalog in memory.
A Catalog is a STACObject that may contain children, which are instances of Catalog or Collection, as well as Item s.
id – Identifier for the catalog. Must be unique within the STAC.
description – Detailed multi-line description to fully explain the catalog. CommonMark 0.29 syntax MAY be used for rich text representation.
title – Optional short descriptive one-line title for the catalog.
stac_extensions – Optional list of extensions the Catalog implements.
href – Optional HREF for this catalog, which be set as the catalog’s self link’s HREF.
catalog_type – Optional catalog type for this catalog. Must be one of the values in CatalogType.
strategy – The layout strategy to use for setting the HREFs of the catalog child objects and items. If not provided, it will default to the strategy of the root and fallback to BestPracticesLayoutStrategy.
Default file name that will be given to this STAC object in a canonical format.
Adds a link to a child Catalog or Collection.
This method will set the child’s parent to this object and potentially override its self_link (unless set_parent is False).
It will always set its root to this Catalog’s root.
child – The child to add.
title – Optional title to give to the Link
strategy – The layout strategy to use for setting the self href of the child. If not provided, defaults to the layout strategy of the parent or root and falls back to BestPracticesLayoutStrategy.
set_parent – Whether to set the parent on the child as well. Defaults to True.
The link created for the child
Adds links to multiple Catalog or ~pystac.Collection objects. This method will set each child’s parent to this object, and their root to this Catalog’s root.
children – The children to add.
strategy – The layout strategy to use for setting the self href of the children. If not provided, defaults to the layout strategy of the parent or root and falls back to BestPracticesLayoutStrategy.
An array of links created for the children
List[Link]
Adds a link to an Item.
This method will set the item’s parent to this object and potentially override its self_link (unless set_parent is False)
It will always set its root to this Catalog’s root.
item – The item to add.
title – Optional title to give to the Link
strategy – The layout strategy to use for setting the self href of the item. If not provided, defaults to the layout strategy of the parent or root and falls back to BestPracticesLayoutStrategy.
set_parent – Whether to set the parent on the item as well. Defaults to True.
The link created for the item
Adds links to multiple Items.
This method will set each item’s parent to this object, and their root to this Catalog’s root.
items – The items to add.
strategy – The layout strategy to use for setting the self href of the items. If not provided, defaults to the layout strategy of the parent or root and falls back to BestPracticesLayoutStrategy.
A list of links created for the item
List[Link]
Add a link to this object’s set of links.
link – The link to add.
Add links to this object’s set of links.
links – The links to add.
The catalog type. Defaults to CatalogType.ABSOLUTE_PUBLISHED.
Removes all children from this catalog.
Returns self
Removes all items from this catalog.
Returns self
Clears all Link instances associated with this object.
rel – If set, only clear links that match this relationship.
Clones this object.
Cloning an object will make a copy of all properties and links of the object; however, it will not make copies of the targets of links (i.e. it is not a deep copy). To copy a STACObject fully, with all linked elements also copied, use full_copy().
The clone of this object.
Prints out information about this Catalog and all contained STACObjects.
include_hrefs (bool) – HREF along with the object ID.
Detailed multi-line description to fully explain the catalog.
Accessor for extension classes on this catalog
Example:
print(collection.ext.version)
Extra fields that are part of the top-level JSON properties of the Catalog.
Parses this STACObject from the passed in dictionary.
d – The dict to parse.
href – Optional href that is the file location of the object being parsed.
root – Optional root catalog for this object. If provided, the root of the returned STACObject will be set to this parameter.
migrate – By default, STAC objects and extensions are migrated to their latest supported version. Set this to False to disable this behavior.
preserve_dict – If False, the dict parameter d may be modified during this method call. Otherwise the dict is not mutated. Defaults to True, which results results in a deepcopy of the parameter. Set to False when possible to avoid the performance hit of a deepcopy.
The STACObject parsed from this dict.
Reads a STACObject implementation from a file.
href – The HREF to read the object from.
stac_io – Optional instance of StacIO to use. If not provided, will use the default instance.
The specific STACObject implementation class that is represented by the JSON read from the file located at HREF.
Create a full copy of this STAC object and any STAC objects linked to by this object.
root – Optional root to set as the root of the copied object, and any other copies that are contained by this object.
parent – Optional parent to set as the parent of the copy of this object.
links to.
Resolves every link in this catalog.
Useful if, e.g., you’d like to read a catalog from a filesystem, upgrade every object in the catalog to the latest STAC version, and save it back to the filesystem. By default, save() skips unresolved links.
Walks through the catalog and generates subcatalogs for items based on the template string.
See LayoutTemplate for details on the construction of template strings. This template string will be applied to the items, and subcatalogs will be created that separate and organize the items based on template values.
template – A template string that can be consumed by a LayoutTemplate
defaults – Default values for the template variables that will be used if the property cannot be found on the item.
parent_ids – Optional list of the parent catalogs’ identifiers. If the bottom-most subcatalogs already match the template, no subcatalog is added.
List of new catalogs created
Get all collections from this catalog and all subcatalogs. Will traverse any subcatalogs recursively.
DEPRECATED.
Deprecated since version 1.8: Use pystac.Catalog.get_items(recursive=True) instead.
Get all items from this catalog and all subcatalogs. Will traverse any subcatalogs recursively.
catalogs or collections connected to this catalog through child links.
Generator[Item]
Gets the child of this catalog with the given ID, if it exists.
id – The ID of the child to find.
recursive – If True, search this catalog and all children for the item; otherwise, only search the children of this catalog. Defaults to False.
sort_links_by_id – If True, links containing the ID will be checked first. If links do not contain the ID then setting this to False will improve performance. Defaults to True.
The child with the given ID, or None if not found.
Catalog or Collection or None
Return all child links of this catalog.
List of links of this catalog with rel == 'child'
List[Link]
Return all children of this catalog.
Iterable of children who’s parent is this catalog.
Iterable[Catalog or Collection]
Return all children of this catalog that are Collection instances.
DEPRECATED.
Deprecated since version 1.8: Use next(pystac.Catalog.get_items(id), None) instead.
Returns an item with a given ID.
id – The ID of the item to find.
recursive – If True, search this catalog and all children for the item; otherwise, only search the items of this catalog. Defaults to False.
The item with the given ID, or None if not found.
Item or None
Return all item links of this catalog.
List of links of this catalog with rel == 'item'
List[Link]
Return all items or specific items of this catalog.
*ids – The IDs of the items to include.
recursive – If True, search this catalog and all children for the item; otherwise, only search the items of this catalog. Defaults to False.
(if recursive) all catalogs or collections connected to this catalog through child links.
Iterator[Item]
Gets the Link instances associated with this object.
rel – If set, filter links such that only those matching this relationship are returned.
media_type – If set, filter the links such that only those matching media_type are returned. media_type can be a single value or a list of values.
rel and/
or media_type if set, or else all links associated with this object.
List[Link]
Get the Catalog or Collection to the parent for this object. The root is represented by a Link with rel == 'parent'.
The parent object for this object, or None if no root link is set.
Catalog, Collection, or None
Get the Catalog or Collection to the root for this object. The root is represented by a Link with rel == 'root'.
The root object for this object, or None if no root link is set.
Catalog, Collection, or None
Get the Link representing the root for this object.
The root link for this object, or None if no root link is set.
Link or None
Gets the absolute HREF that is represented by the rel == 'self' Link.
The absolute HREF of this object, or None if there is no self link defined.
str or None
Note
A self link can exist for objects, even if the link is not read or written to the JSON-serialized version of the object. Any object read from STACObject.from_file will have the HREF the file was read from set as it’s self HREF. All self links have absolute (as opposed to relative) HREFs.
Get a single Link instance associated with this object.
rel – If set, filter links such that only those matching this relationship are returned.
media_type – If set, filter the links such that only those matching media_type are returned. media_type can be a single value or a list of values.
rel
and/or media_type, or else the first link associated with this object.
Link | None
Gets the STACObject instances that are linked to by links with their rel property matching the passed in argument.
rel – The relation to match each Link’s rel property against.
typ – If not None, objects will only be yielded if they are instances of typ.
modify_links – A function that modifies the list of links before they are iterated over. For instance, this option can be used to sort the list so that links matching a particular pattern are earlier in the iterator.
connected to this object through links with the given rel and are of type typ (if given).
Iterable[STACObject]
Identifier for the catalog.
A list of Link objects representing all links associated with this Catalog.
Recursively makes all the HREFs of assets in this catalog absolute
Recursively makes all the HREFs of assets in this catalog relative
Creates a copy of a catalog, with each Asset for each Item passed through the asset_mapper function.
asset_mapper – A function that takes in an key and an Asset, and returns either an Asset, a (key, Asset), or a dictionary of Assets with unique keys. The Asset that is passed into the item_mapper is a copy, so the method can mutate it safely.
A full copy of this catalog, with assets manipulated according to the asset_mapper function.
Creates a copy of a catalog, with each item passed through the item_mapper function.
item_mapper – A function that takes in an item, and returns either an item or list of items. The item that is passed into the item_mapper is a copy, so the method can mutate it safely.
A full copy of this catalog, with items manipulated according to the item_mapper function.
Returns a boolean indicating whether the given dictionary represents a valid instance of this STACObject sub-class.
d – A dictionary to identify
Normalizes link HREFs to the given root_href, and saves the catalog.
This is a convenience method that simply calls Catalog.normalize_hrefs and Catalog.save in sequence.
root_href – The absolute HREF that all links will be normalized against.
catalog_type – The catalog type that dictates the structure of the catalog to save. Use a member of CatalogType. Defaults to the root catalog.catalog_type or the current catalog catalog_type if there is no root catalog.
strategy – The layout strategy to use in setting the HREFS for this catalog. If not provided, defaults to the layout strategy of the parent or root and falls back to BestPracticesLayoutStrategy
stac_io – Optional instance of StacIO to use. If not provided, will use the instance set while reading in the catalog, or the default instance if this is not available.
skip_unresolved – Skip unresolved links when normalizing the tree. Defaults to False. Because unresolved links are not saved, this argument can be used to normalize and save only newly-added objects.
Normalize HREFs will regenerate all link HREFs based on an absolute root_href and the canonical catalog layout as specified in the STAC specification’s best practices.
This method mutates the entire catalog tree, unless skip_unresolved is True, in which case only resolved links are modified. This is useful in the case when you have loaded a large catalog and you’ve added a few items/children, and you only want to update those newly-added objects, not the whole tree.
root_href – The absolute HREF that all links will be normalized against.
strategy – The layout strategy to use in setting the HREFS for this catalog. If not provided, defaults to the layout strategy of the parent or root and falls back to BestPracticesLayoutStrategy
skip_unresolved – Skip unresolved links when normalizing the tree. Defaults to False.
STAC best practices document for the canonical layout of a STAC.
Removes an child from this catalog.
child_id – The ID of the child to remove.
Removes all hierarchical links from this object.
See pystac.link.HIERARCHICAL_LINKS for a list of all hierarchical links. If the object has a self href and add_canonical is True, a link with rel="canonical" is added.
add_canonical – If true, and this item has a self href, that href is used to build a canonical link.
All removed links
List[Link]
Removes an item from this catalog.
item_id – The ID of the item to remove.
Remove links to this object’s set of links that match the given rel.
rel – The Link rel to match on.
Ensure all STACObjects linked to by this STACObject are resolved. This is important for operations such as changing HREFs.
This method mutates the entire catalog tree.
Save this catalog and all it’s children/item to files determined by the object’s self link HREF or a specified path.
catalog_type – The catalog type that dictates the structure of the catalog to save. Use a member of CatalogType. If not supplied, the catalog_type of this catalog will be used. If that attribute is not set, an exception will be raised.
dest_href – The location where the catalog is to be saved. If not supplied, the catalog’s self link HREF is used to determine the location of the catalog file and children’s files.
stac_io – Optional instance of StacIO to use. If not provided, will use the instance set while reading in the catalog, or the default instance if this is not available.
Note
If the catalog type is CatalogType.ABSOLUTE_PUBLISHED, all self links will be included, and hierarchical links be absolute URLs. If the catalog type is CatalogType.RELATIVE_PUBLISHED, this catalog’s self link will be included, but no child catalog will have self links, and hierarchical links will be relative URLs If the catalog type is CatalogType.SELF_CONTAINED, no self links will be included and hierarchical links will be relative URLs.
Saves this STACObject to it’s ‘self’ HREF.
include_self_link – If this is true, include the ‘self’ link with this object. Otherwise, leave out the self link.
dest_href – Optional HREF to save the file to. If None, the object will be saved to the object’s self href.
stac_io – Optional instance of StacIO to use. If not provided, will use the instance set on the object’s root if available, otherwise will use the default instance.
STACError – If no self href is set, this error will be raised.
Gets the absolute HREF that is represented by the rel == 'self' Link.
ValueError – If the self_href is not set, this method will throw a ValueError. Use get_self_href if there may not be an href set.
Sets the parent Catalog or Collection for this object.
parent – The parent object to set. Passing in None will clear the parent.
Sets the root Catalog or Collection for this object.
root – The root object to set. Passing in None will clear the root.
Sets the absolute HREF that is represented by the rel == 'self' Link.
href – The absolute HREF of this object. If the given HREF is not absolute, it will be transformed to an absolute HREF based on the current working directory. If this is None the call will clear the self HREF link.
List of extensions the Catalog implements.
Determine if target is somewhere in the hierarchical link tree of a STACObject.
target – A string or STACObject to search for
for the current STACObject
Optional short descriptive one-line title for the catalog.
Returns this object as a dictionary.
include_self_link – If True, the dict will contain a self link to this object. If False, the self link will be omitted.
transform_hrefs – If True, transform the HREF of hierarchical links based on the type of catalog this object belongs to (if any). I.e. if this object belongs to a root catalog that is RELATIVE_PUBLISHED or SELF_CONTAINED, hierarchical link HREFs will be transformed to be relative to the catalog root.
dict – A serialization of the object.
Validate this STACObject.
Returns a list of validation results, which depends on the validation implementation. For JSON Schema validation (default validator), this will be a list of schema URIs that were used during validation.
validator – A custom validator to use for validation of the object. If omitted, the default validator from RegisteredValidator will be used instead.
Validates each catalog, collection, item contained within this catalog.
Walks through the children and items of the catalog and validates each stac object.
max_items – The maximum number of STAC items to validate. Default is None which means, validate them all.
recursive – Whether to validate catalog, collections, and items contained within child objects.
Number of STAC items validated.
STACValidationError – Raises this error on any item that is invalid. Will raise on the first invalid stac object encountered.
Walks through children and items of catalogs.
For each catalog in the STAC’s tree rooted at this catalog (including this catalog itself), it yields a 3-tuple (root, subcatalogs, items). The root in that 3-tuple refers to the current catalog being walked, the subcatalogs are any catalogs or collections for which the root is a parent, and items represents any items that have the root as a parent.
This has similar functionality to Python’s os.walk().
An enumeration.
Absolute Published Catalog is a catalog that uses absolute links for everything, both in the links objects and in the asset hrefs.
Relative Published Catalog is a catalog that uses relative links for everything, but includes an absolute self link at the root catalog, to identify its online location.
A ‘self-contained catalog’ is one that is designed for portability. Users may want to download an online catalog from and be able to use it on their local computer, so all links need to be relative.
Return a capitalized version of the string.
More specifically, make the first character have upper case and the rest lower case.
Return a version of the string suitable for caseless comparisons.
Return a centered string of length width.
Padding is done using the specified fill character (default is a space).
Return the number of non-overlapping occurrences of substring sub in string S[start:end]. Optional arguments start and end are interpreted as in slice notation.
Determines the catalog type based on a STAC JSON dict.
Only applies to Catalogs or Collections
stac_json – The STAC JSON dict to determine the catalog type
The catalog type of the catalog or collection. Will return None if it cannot be determined.
Optional[CatalogType]
Encode the string using the codec registered for encoding.
The encoding in which to encode the string.
The error handling scheme to use for encoding errors. The default is ‘strict’ meaning that encoding errors raise a UnicodeEncodeError. Other possible values are ‘ignore’, ‘replace’ and ‘xmlcharrefreplace’ as well as any other name registered with codecs.register_error that can handle UnicodeEncodeErrors.
Return True if S ends with the specified suffix, False otherwise. With optional start, test S beginning at that position. With optional end, stop comparing S at that position. suffix can also be a tuple of strings to try.
Return a copy where all tab characters are expanded using spaces.
If tabsize is not given, a tab size of 8 characters is assumed.
Return the lowest index in S where substring sub is found, such that sub is contained within S[start:end]. Optional arguments start and end are interpreted as in slice notation.
Return -1 on failure.
Return a formatted version of S, using substitutions from args and kwargs. The substitutions are identified by braces (‘{’ and ‘}’).
Return a formatted version of S, using substitutions from mapping. The substitutions are identified by braces (‘{’ and ‘}’).
Return the lowest index in S where substring sub is found, such that sub is contained within S[start:end]. Optional arguments start and end are interpreted as in slice notation.
Raises ValueError when the substring is not found.
Return True if the string is an alpha-numeric string, False otherwise.
A string is alpha-numeric if all characters in the string are alpha-numeric and there is at least one character in the string.
Return True if the string is an alphabetic string, False otherwise.
A string is alphabetic if all characters in the string are alphabetic and there is at least one character in the string.
Return True if all characters in the string are ASCII, False otherwise.
ASCII characters have code points in the range U+0000-U+007F. Empty string is ASCII too.
Return True if the string is a decimal string, False otherwise.
A string is a decimal string if all characters in the string are decimal and there is at least one character in the string.
Return True if the string is a digit string, False otherwise.
A string is a digit string if all characters in the string are digits and there is at least one character in the string.
Return True if the string is a valid Python identifier, False otherwise.
Call keyword.iskeyword(s) to test whether string s is a reserved identifier, such as “def” or “class”.
Return True if the string is a lowercase string, False otherwise.
A string is lowercase if all cased characters in the string are lowercase and there is at least one cased character in the string.
Return True if the string is a numeric string, False otherwise.
A string is numeric if all characters in the string are numeric and there is at least one character in the string.
Return True if the string is printable, False otherwise.
A string is printable if all of its characters are considered printable in repr() or if it is empty.
Return True if the string is a whitespace string, False otherwise.
A string is whitespace if all characters in the string are whitespace and there is at least one character in the string.
Return True if the string is a title-cased string, False otherwise.
In a title-cased string, upper- and title-case characters may only follow uncased characters and lowercase characters only cased ones.
Return True if the string is an uppercase string, False otherwise.
A string is uppercase if all cased characters in the string are uppercase and there is at least one cased character in the string.
Concatenate any number of strings.
The string whose method is called is inserted in between each given string. The result is returned as a new string.
Example: ‘.’.join([‘ab’, ‘pq’, ‘rs’]) -> ‘ab.pq.rs’
Return a left-justified string of length width.
Padding is done using the specified fill character (default is a space).
Return a copy of the string converted to lowercase.
Return a copy of the string with leading whitespace removed.
If chars is given and not None, remove characters in chars instead.
Return a translation table usable for str.translate().
If there is only one argument, it must be a dictionary mapping Unicode ordinals (integers) or characters to Unicode ordinals, strings or None. Character keys will be then converted to ordinals. If there are two arguments, they must be strings of equal length, and in the resulting dictionary, each character in x will be mapped to the character at the same position in y. If there is a third argument, it must be a string, whose characters will be mapped to None in the result.
Partition the string into three parts using the given separator.
This will search for the separator in the string. If the separator is found, returns a 3-tuple containing the part before the separator, the separator itself, and the part after it.
If the separator is not found, returns a 3-tuple containing the original string and two empty strings.
Return a str with the given prefix string removed if present.
If the string starts with the prefix string, return string[len(prefix):]. Otherwise, return a copy of the original string.
Return a str with the given suffix string removed if present.
If the string ends with the suffix string and that suffix is not empty, return string[:-len(suffix)]. Otherwise, return a copy of the original string.
Return a copy with all occurrences of substring old replaced by new.
- count
Maximum number of occurrences to replace. -1 (the default value) means replace all occurrences.
If the optional argument count is given, only the first count occurrences are replaced.
Return the highest index in S where substring sub is found, such that sub is contained within S[start:end]. Optional arguments start and end are interpreted as in slice notation.
Return -1 on failure.
Return the highest index in S where substring sub is found, such that sub is contained within S[start:end]. Optional arguments start and end are interpreted as in slice notation.
Raises ValueError when the substring is not found.
Return a right-justified string of length width.
Padding is done using the specified fill character (default is a space).
Partition the string into three parts using the given separator.
This will search for the separator in the string, starting at the end. If the separator is found, returns a 3-tuple containing the part before the separator, the separator itself, and the part after it.
If the separator is not found, returns a 3-tuple containing two empty strings and the original string.
Return a list of the substrings in the string, using sep as the separator string.
- sep
The separator used to split the string.
When set to None (the default value), will split on any whitespace character (including \n \r \t \f and spaces) and will discard empty strings from the result.
- maxsplit
Maximum number of splits (starting from the left). -1 (the default value) means no limit.
Splitting starts at the end of the string and works to the front.
Return a copy of the string with trailing whitespace removed.
If chars is given and not None, remove characters in chars instead.
Return a list of the substrings in the string, using sep as the separator string.
- sep
The separator used to split the string.
When set to None (the default value), will split on any whitespace character (including \n \r \t \f and spaces) and will discard empty strings from the result.
- maxsplit
Maximum number of splits (starting from the left). -1 (the default value) means no limit.
Note, str.split() is mainly useful for data that has been intentionally delimited. With natural text that includes punctuation, consider using the regular expression module.
Return a list of the lines in the string, breaking at line boundaries.
Line breaks are not included in the resulting list unless keepends is given and true.
Return True if S starts with the specified prefix, False otherwise. With optional start, test S beginning at that position. With optional end, stop comparing S at that position. prefix can also be a tuple of strings to try.
Return a copy of the string with leading and trailing whitespace removed.
If chars is given and not None, remove characters in chars instead.
Convert uppercase characters to lowercase and lowercase characters to uppercase.
Return a version of the string where each word is titlecased.
More specifically, words start with uppercased characters and all remaining cased characters have lower case.
Replace each character in the string using the given translation table.
- table
Translation table, which must be a mapping of Unicode ordinals to Unicode ordinals, strings, or None.
The table must implement lookup/indexing via __getitem__, for instance a dictionary or list. If this operation raises LookupError, the character is left untouched. Characters mapped to None are deleted.
Return a copy of the string converted to uppercase.
Pad a numeric string with zeros on the left, to fill a field of the given width.
The string is never truncated.
A Collection extends the Catalog spec with additional metadata that helps enable discovery.
id – Identifier for the collection. Must be unique within the STAC.
description –
Detailed multi-line description to fully explain the collection. CommonMark 0.29 syntax MAY be used for rich text representation.
extent – Spatial and temporal extents that describe the bounds of all items contained within this Collection.
title – Optional short descriptive one-line title for the collection.
stac_extensions – Optional list of extensions the Collection implements.
href – Optional HREF for this collection, which be set as the collection’s self link’s HREF.
catalog_type – Optional catalog type for this catalog. Must be one of the values in :class`~pystac.CatalogType`.
license – Collection’s license(s) as a SPDX License identifier, or other. If collection includes data with multiple different licenses, use other and add a link for each. The licenses various and proprietary are deprecated. Defaults to ‘other’.
keywords – Optional list of keywords describing the collection.
providers – Optional list of providers of this Collection.
summaries – An optional map of property summaries, either a set of values or statistics such as a range.
extra_fields – Extra fields that are part of the top-level JSON properties of the Collection.
assets – A dictionary mapping string keys to Asset objects. All Asset values in the dictionary will have their owner attribute set to the created Collection.
strategy – The layout strategy to use for setting the HREFs of the catalog child objects and items. If not provided, it will default to strategy of the parent and fallback to BestPracticesLayoutStrategy.
Default file name that will be given to this STAC object in a canonical format.
Adds an Asset to this object.
key – The unique key of this asset.
asset – The Asset to add.
Adds a link to a child Catalog or Collection.
This method will set the child’s parent to this object and potentially override its self_link (unless set_parent is False).
It will always set its root to this Catalog’s root.
child – The child to add.
title – Optional title to give to the Link
strategy – The layout strategy to use for setting the self href of the child. If not provided, defaults to the layout strategy of the parent or root and falls back to BestPracticesLayoutStrategy.
set_parent – Whether to set the parent on the child as well. Defaults to True.
The link created for the child
Adds links to multiple Catalog or ~pystac.Collection objects. This method will set each child’s parent to this object, and their root to this Catalog’s root.
children – The children to add.
strategy – The layout strategy to use for setting the self href of the children. If not provided, defaults to the layout strategy of the parent or root and falls back to BestPracticesLayoutStrategy.
An array of links created for the children
List[Link]
Adds a link to an Item.
This method will set the item’s parent to this object and potentially override its self_link (unless set_parent is False)
It will always set its root to this Catalog’s root.
item – The item to add.
title – Optional title to give to the Link
strategy – The layout strategy to use for setting the self href of the item. If not provided, defaults to the layout strategy of the parent or root and falls back to BestPracticesLayoutStrategy.
set_parent – Whether to set the parent on the item as well. Defaults to True.
The link created for the item
Adds links to multiple Items.
This method will set each item’s parent to this object, and their root to this Catalog’s root.
items – The items to add.
strategy – The layout strategy to use for setting the self href of the items. If not provided, defaults to the layout strategy of the parent or root and falls back to BestPracticesLayoutStrategy.
A list of links created for the item
List[Link]
Add a link to this object’s set of links.
link – The link to add.
Add links to this object’s set of links.
links – The links to add.
The asset dictionary.
The catalog type. Defaults to CatalogType.ABSOLUTE_PUBLISHED.
Removes all children from this catalog.
Returns self
Removes all items from this catalog.
Returns self
Clears all Link instances associated with this object.
rel – If set, only clear links that match this relationship.
Clones this object.
Cloning an object will make a copy of all properties and links of the object; however, it will not make copies of the targets of links (i.e. it is not a deep copy). To copy a STACObject fully, with all linked elements also copied, use full_copy().
The clone of this object.
Deletes the asset at the given key, and removes the asset’s data file from the local filesystem.
It is an error to attempt to delete an asset’s file if it is on a remote filesystem.
To delete the asset without removing the file, use del item.assets[“key”].
key – The unique key of this asset.
Prints out information about this Catalog and all contained STACObjects.
include_hrefs (bool) – HREF along with the object ID.
Detailed multi-line description to fully explain the collection.
Accessor for extension classes on this collection
Example:
print(collection.ext.xarray)
Spatial and temporal extents that describe the bounds of all items contained within this Collection.
Extra fields that are part of the top-level JSON properties of the Collection.
Parses this STACObject from the passed in dictionary.
d – The dict to parse.
href – Optional href that is the file location of the object being parsed.
root – Optional root catalog for this object. If provided, the root of the returned STACObject will be set to this parameter.
migrate – By default, STAC objects and extensions are migrated to their latest supported version. Set this to False to disable this behavior.
preserve_dict – If False, the dict parameter d may be modified during this method call. Otherwise the dict is not mutated. Defaults to True, which results results in a deepcopy of the parameter. Set to False when possible to avoid the performance hit of a deepcopy.
The STACObject parsed from this dict.
Reads a STACObject implementation from a file.
href – The HREF to read the object from.
stac_io – Optional instance of StacIO to use. If not provided, will use the default instance.
The specific STACObject implementation class that is represented by the JSON read from the file located at HREF.
Create a Collection from iterable of items or an ItemCollection.
Will try to pull collection attributes from extra_fields and items when possible.
items – Iterable of Item instances to include in the Collection. This can be a ItemCollection.
id – Identifier for the collection. If not set, must be available on the items and they must all match.
strategy – The layout strategy to use for setting the HREFs of the catalog child objects and items. If not provided, it will default to strategy of the parent and fallback to BestPracticesLayoutStrategy.
Create a full copy of this STAC object and any STAC objects linked to by this object.
root – Optional root to set as the root of the copied object, and any other copies that are contained by this object.
parent – Optional parent to set as the parent of the copy of this object.
links to.
Resolves every link in this catalog.
Useful if, e.g., you’d like to read a catalog from a filesystem, upgrade every object in the catalog to the latest STAC version, and save it back to the filesystem. By default, save() skips unresolved links.
Walks through the catalog and generates subcatalogs for items based on the template string.
See LayoutTemplate for details on the construction of template strings. This template string will be applied to the items, and subcatalogs will be created that separate and organize the items based on template values.
template – A template string that can be consumed by a LayoutTemplate
defaults – Default values for the template variables that will be used if the property cannot be found on the item.
parent_ids – Optional list of the parent catalogs’ identifiers. If the bottom-most subcatalogs already match the template, no subcatalog is added.
List of new catalogs created
Get all collections from this catalog and all subcatalogs. Will traverse any subcatalogs recursively.
DEPRECATED.
Deprecated since version 1.8: Use pystac.Catalog.get_items(recursive=True) instead.
Get all items from this catalog and all subcatalogs. Will traverse any subcatalogs recursively.
catalogs or collections connected to this catalog through child links.
Generator[Item]
Get this object’s assets.
media_type – If set, filter the assets such that only those with a matching media_type are returned.
role – If set, filter the assets such that only those with a matching role are returned.
media_type
and/or role if set or else all of this object’s assets.
Gets the child of this catalog with the given ID, if it exists.
id – The ID of the child to find.
recursive – If True, search this catalog and all children for the item; otherwise, only search the children of this catalog. Defaults to False.
sort_links_by_id – If True, links containing the ID will be checked first. If links do not contain the ID then setting this to False will improve performance. Defaults to True.
The child with the given ID, or None if not found.
Catalog or Collection or None
Return all child links of this catalog.
List of links of this catalog with rel == 'child'
List[Link]
Return all children of this catalog.
Iterable of children who’s parent is this catalog.
Iterable[Catalog or Collection]
Return all children of this catalog that are Collection instances.
Returns an item with a given ID.
id – The ID of the item to find.
recursive – If True, search this collection and all children for the item; otherwise, only search the items of this collection. Defaults to False.
The item with the given ID, or None if not found.
Item or None
Return all item links of this catalog.
List of links of this catalog with rel == 'item'
List[Link]
Return all items or specific items of this catalog.
*ids – The IDs of the items to include.
recursive – If True, search this catalog and all children for the item; otherwise, only search the items of this catalog. Defaults to False.
(if recursive) all catalogs or collections connected to this catalog through child links.
Iterator[Item]
Gets the Link instances associated with this object.
rel – If set, filter links such that only those matching this relationship are returned.
media_type – If set, filter the links such that only those matching media_type are returned. media_type can be a single value or a list of values.
rel and/
or media_type if set, or else all links associated with this object.
List[Link]
Get the Catalog or Collection to the parent for this object. The root is represented by a Link with rel == 'parent'.
The parent object for this object, or None if no root link is set.
Catalog, Collection, or None
Get the Catalog or Collection to the root for this object. The root is represented by a Link with rel == 'root'.
The root object for this object, or None if no root link is set.
Catalog, Collection, or None
Get the Link representing the root for this object.
The root link for this object, or None if no root link is set.
Link or None
Gets the absolute HREF that is represented by the rel == 'self' Link.
The absolute HREF of this object, or None if there is no self link defined.
str or None
Note
A self link can exist for objects, even if the link is not read or written to the JSON-serialized version of the object. Any object read from STACObject.from_file will have the HREF the file was read from set as it’s self HREF. All self links have absolute (as opposed to relative) HREFs.
Get a single Link instance associated with this object.
rel – If set, filter links such that only those matching this relationship are returned.
media_type – If set, filter the links such that only those matching media_type are returned. media_type can be a single value or a list of values.
rel
and/or media_type, or else the first link associated with this object.
Link | None
Gets the STACObject instances that are linked to by links with their rel property matching the passed in argument.
rel – The relation to match each Link’s rel property against.
typ – If not None, objects will only be yielded if they are instances of typ.
modify_links – A function that modifies the list of links before they are iterated over. For instance, this option can be used to sort the list so that links matching a particular pattern are earlier in the iterator.
connected to this object through links with the given rel and are of type typ (if given).
Iterable[STACObject]
Identifier for the collection.
Accessor for item_assets on this collection.
Example:
>>> print(collection.item_assets)
{'thumbnail': <pystac.item_assets.ItemAssetDefinition at 0x72aea0420750>,
'metadata': <pystac.item_assets.ItemAssetDefinition at 0x72aea017dc90>,
'B5': <pystac.item_assets.ItemAssetDefinition at 0x72aea017efd0>,
'B6': <pystac.item_assets.ItemAssetDefinition at 0x72aea016d5d0>,
'B7': <pystac.item_assets.ItemAssetDefinition at 0x72aea016e050>,
'B8': <pystac.item_assets.ItemAssetDefinition at 0x72aea016da90>}
>>> collection.item_assets["thumbnail"].title
'Thumbnail'
Set attributes on ItemAssetDefinition objects
>>> collection.item_assets["thumbnail"].title = "New Title"
Add to the item_assets dict:
>>> collection.item_assets["B4"] = {
'type': 'image/tiff; application=geotiff; profile=cloud-optimized',
'eo:bands': [{'name': 'B4', 'common_name': 'red'}]
}
>>> collection.item_assets["B4"].owner == collection
True
Optional list of keywords describing the collection.
A list of Link objects representing all links associated with this Collection.
Recursively makes all the HREFs of assets in this catalog absolute
Recursively makes all the HREFs of assets in this catalog relative
Modify each asset’s HREF to be absolute.
Any asset HREFs that are relative will be modified to absolute based on this item’s self HREF.
self
Modify each asset’s HREF to be relative to this object’s self HREF.
self
Creates a copy of a catalog, with each Asset for each Item passed through the asset_mapper function.
asset_mapper – A function that takes in an key and an Asset, and returns either an Asset, a (key, Asset), or a dictionary of Assets with unique keys. The Asset that is passed into the item_mapper is a copy, so the method can mutate it safely.
A full copy of this catalog, with assets manipulated according to the asset_mapper function.
Creates a copy of a catalog, with each item passed through the item_mapper function.
item_mapper – A function that takes in an item, and returns either an item or list of items. The item that is passed into the item_mapper is a copy, so the method can mutate it safely.
A full copy of this catalog, with items manipulated according to the item_mapper function.
Returns a boolean indicating whether the given dictionary represents a valid instance of this STACObject sub-class.
d – A dictionary to identify
Normalizes link HREFs to the given root_href, and saves the catalog.
This is a convenience method that simply calls Catalog.normalize_hrefs and Catalog.save in sequence.
root_href – The absolute HREF that all links will be normalized against.
catalog_type – The catalog type that dictates the structure of the catalog to save. Use a member of CatalogType. Defaults to the root catalog.catalog_type or the current catalog catalog_type if there is no root catalog.
strategy – The layout strategy to use in setting the HREFS for this catalog. If not provided, defaults to the layout strategy of the parent or root and falls back to BestPracticesLayoutStrategy
stac_io – Optional instance of StacIO to use. If not provided, will use the instance set while reading in the catalog, or the default instance if this is not available.
skip_unresolved – Skip unresolved links when normalizing the tree. Defaults to False. Because unresolved links are not saved, this argument can be used to normalize and save only newly-added objects.
Normalize HREFs will regenerate all link HREFs based on an absolute root_href and the canonical catalog layout as specified in the STAC specification’s best practices.
This method mutates the entire catalog tree, unless skip_unresolved is True, in which case only resolved links are modified. This is useful in the case when you have loaded a large catalog and you’ve added a few items/children, and you only want to update those newly-added objects, not the whole tree.
root_href – The absolute HREF that all links will be normalized against.
strategy – The layout strategy to use in setting the HREFS for this catalog. If not provided, defaults to the layout strategy of the parent or root and falls back to BestPracticesLayoutStrategy
skip_unresolved – Skip unresolved links when normalizing the tree. Defaults to False.
STAC best practices document for the canonical layout of a STAC.
Optional list of providers of this Collection.
Removes an child from this catalog.
child_id – The ID of the child to remove.
Removes all hierarchical links from this object.
See pystac.link.HIERARCHICAL_LINKS for a list of all hierarchical links. If the object has a self href and add_canonical is True, a link with rel="canonical" is added.
add_canonical – If true, and this item has a self href, that href is used to build a canonical link.
All removed links
List[Link]
Removes an item from this catalog.
item_id – The ID of the item to remove.
Remove links to this object’s set of links that match the given rel.
rel – The Link rel to match on.
Ensure all STACObjects linked to by this STACObject are resolved. This is important for operations such as changing HREFs.
This method mutates the entire catalog tree.
Save this catalog and all it’s children/item to files determined by the object’s self link HREF or a specified path.
catalog_type – The catalog type that dictates the structure of the catalog to save. Use a member of CatalogType. If not supplied, the catalog_type of this catalog will be used. If that attribute is not set, an exception will be raised.
dest_href – The location where the catalog is to be saved. If not supplied, the catalog’s self link HREF is used to determine the location of the catalog file and children’s files.
stac_io – Optional instance of StacIO to use. If not provided, will use the instance set while reading in the catalog, or the default instance if this is not available.
Note
If the catalog type is CatalogType.ABSOLUTE_PUBLISHED, all self links will be included, and hierarchical links be absolute URLs. If the catalog type is CatalogType.RELATIVE_PUBLISHED, this catalog’s self link will be included, but no child catalog will have self links, and hierarchical links will be relative URLs If the catalog type is CatalogType.SELF_CONTAINED, no self links will be included and hierarchical links will be relative URLs.
Saves this STACObject to it’s ‘self’ HREF.
include_self_link – If this is true, include the ‘self’ link with this object. Otherwise, leave out the self link.
dest_href – Optional HREF to save the file to. If None, the object will be saved to the object’s self href.
stac_io – Optional instance of StacIO to use. If not provided, will use the instance set on the object’s root if available, otherwise will use the default instance.
STACError – If no self href is set, this error will be raised.
Gets the absolute HREF that is represented by the rel == 'self' Link.
ValueError – If the self_href is not set, this method will throw a ValueError. Use get_self_href if there may not be an href set.
Sets the parent Catalog or Collection for this object.
parent – The parent object to set. Passing in None will clear the parent.
Sets the root Catalog or Collection for this object.
root – The root object to set. Passing in None will clear the root.
Sets the absolute HREF that is represented by the rel == 'self' Link.
href – The absolute HREF of this object. If the given HREF is not absolute, it will be transformed to an absolute HREF based on the current working directory. If this is None the call will clear the self HREF link.
List of extensions the Collection implements.
A map of property summaries, either a set of values or statistics such as a range.
Determine if target is somewhere in the hierarchical link tree of a STACObject.
target – A string or STACObject to search for
for the current STACObject
Optional short descriptive one-line title for the collection.
Returns this object as a dictionary.
include_self_link – If True, the dict will contain a self link to this object. If False, the self link will be omitted.
transform_hrefs – If True, transform the HREF of hierarchical links based on the type of catalog this object belongs to (if any). I.e. if this object belongs to a root catalog that is RELATIVE_PUBLISHED or SELF_CONTAINED, hierarchical link HREFs will be transformed to be relative to the catalog root.
dict – A serialization of the object.
Update datetime and bbox based on all items to a single bbox and time window.
Validate this STACObject.
Returns a list of validation results, which depends on the validation implementation. For JSON Schema validation (default validator), this will be a list of schema URIs that were used during validation.
validator – A custom validator to use for validation of the object. If omitted, the default validator from RegisteredValidator will be used instead.
Validates each catalog, collection, item contained within this catalog.
Walks through the children and items of the catalog and validates each stac object.
max_items – The maximum number of STAC items to validate. Default is None which means, validate them all.
recursive – Whether to validate catalog, collections, and items contained within child objects.
Number of STAC items validated.
STACValidationError – Raises this error on any item that is invalid. Will raise on the first invalid stac object encountered.
Walks through children and items of catalogs.
For each catalog in the STAC’s tree rooted at this catalog (including this catalog itself), it yields a 3-tuple (root, subcatalogs, items). The root in that 3-tuple refers to the current catalog being walked, the subcatalogs are any catalogs or collections for which the root is a parent, and items represents any items that have the root as a parent.
This has similar functionality to Python’s os.walk().
Describes the spatiotemporal extents of a Collection.
spatial – Potential spatial extent covered by the collection.
temporal – Potential temporal extent covered by the collection.
extra_fields – Dictionary containing additional top-level fields defined on the Extent object.
Clones this object.
The clone of this extent.
Dictionary containing additional top-level fields defined on the Extent object.
Constructs an Extent from a dict.
The Extent deserialized from the JSON dict.
Create an Extent based on the datetimes and bboxes of a list of items.
items – A list of items to derive the extent from.
extra_fields – Optional dictionary containing additional top-level fields defined on the Extent object.
An Extent that spatially and temporally covers all of the given items.
Potential spatial extent covered by the collection.
Potential temporal extent covered by the collection.
Returns this extent as a dictionary.
A serialization of the Extent.
Describes the spatial extent of a Collection.
bboxes – A list of bboxes that represent the spatial extent of the collection. Each bbox can be 2D or 3D. The length of the bbox array must be 2*n where n is the number of dimensions. For example, a 2D Collection with only one bbox would be [[xmin, ymin, xmax, ymax]]
extra_fields – Dictionary containing additional top-level fields defined on the Spatial Extent object.
A list of bboxes that represent the spatial extent of the collection. Each bbox can be 2D or 3D. The length of the bbox array must be 2*n where n is the number of dimensions. For example, a 2D Collection with only one bbox would be [[xmin, ymin, xmax, ymax]]
Clones this object.
The clone of this object.
Dictionary containing additional top-level fields defined on the Spatial Extent object.
Constructs a SpatialExtent from a set of coordinates.
This method will only produce a single bbox that covers all points in the coordinate set.
coordinates – Coordinates to derive the bbox from.
extra_fields – Dictionary containing additional top-level fields defined on the SpatialExtent object.
A SpatialExtent with a single bbox that covers the given coordinates.
Constructs a SpatialExtent from a dict.
The SpatialExtent deserialized from the JSON dict.
Returns this spatial extent as a dictionary.
A serialization of the SpatialExtent.
Describes the temporal extent of a Collection.
intervals – A list of two datetimes wrapped in a list, representing the temporal extent of a Collection. Open date ranges are supported by setting either the start (the first element of the interval) or the end (the second element of the interval) to None.
extra_fields – Dictionary containing additional top-level fields defined on the Temporal Extent object.
Note
Datetimes are required to be in UTC.
Clones this object.
The clone of this object.
Dictionary containing additional top-level fields defined on the Temporal Extent object.
Constructs an TemporalExtent from a dict.
The TemporalExtent deserialized from the JSON dict.
Constructs an TemporalExtent with a single open interval that has the start time as the current time.
The resulting TemporalExtent.
A list of two datetimes wrapped in a list, representing the temporal extent of a Collection. Open date ranges are represented by either the start (the first element of the interval) or the end (the second element of the interval) being None.
Returns this temporal extent as a dictionary.
A serialization of the TemporalExtent.
Enumerates the allows values of the Provider “role” field.
Provides information about a provider of STAC data. A provider is any of the organizations that captured or processed the content of the collection and therefore influenced the data offered by this collection. May also include information about the final storage provider hosting the data.
name – The name of the organization or the individual.
description – Optional multi-line description to add further provider information such as processing details for processors and producers, hosting details for hosts or basic contact information.
roles – Optional roles of the provider. Any of licensor, producer, processor or host.
url – Optional homepage on which the provider describes the dataset and publishes contact information.
extra_fields – Optional dictionary containing additional top-level fields defined on the Provider object.
Optional multi-line description to add further provider information such as processing details for processors and producers, hosting details for hosts or basic contact information.
Dictionary containing additional top-level fields defined on the Provider object.
Constructs an Provider from a dict.
The Provider deserialized from the JSON dict.
The name of the organization or the individual.
Optional roles of the provider. Any of licensor, producer, processor or host.
Returns this provider as a dictionary.
A serialization of the Provider.
Optional homepage on which the provider describes the dataset and publishes contact information.
Clones this object.
The clone of this object
An Item is the core granular entity in a STAC, containing the core metadata that enables any client to search or crawl online catalogs of spatial ‘assets’ - satellite imagery, derived data, DEM’s, etc.
id – Provider identifier. Must be unique within the STAC.
geometry – Defines the full footprint of the asset represented by this item, formatted according to RFC 7946, section 3.1 (GeoJSON).
bbox – Bounding Box of the asset represented by this item using either 2D or 3D geometries. The length of the array must be 2*n where n is the number of dimensions. Could also be None in the case of a null geometry.
datetime – datetime associated with this item. If None, a start_datetime and end_datetime must be supplied.
properties – A dictionary of additional metadata for the item.
start_datetime – Optional inclusive start datetime, part of common metadata. This value will override any start_datetime key in properties.
end_datetime – Optional inclusive end datetime, part of common metadata. This value will override any end_datetime key in properties.
stac_extensions – Optional list of extensions the Item implements.
href – Optional HREF for this item, which be set as the item’s self link’s HREF.
collection – The Collection or Collection ID that this item belongs to.
extra_fields – Extra fields that are part of the top-level JSON properties of the Item.
assets – A dictionary mapping string keys to Asset objects. All Asset values in the dictionary will have their owner attribute set to the created Item.
Adds an Asset to this object.
key – The unique key of this asset.
asset – The Asset to add.
Add one or more items that this is derived from.
This method will add to any existing “derived_from” links.
items – Items (or href of items) to add to derived_from links.
self
Add a link to this object’s set of links.
link – The link to add.
Add links to this object’s set of links.
links – The links to add.
Dictionary of Asset objects, each with a unique key.
Bounding Box of the asset represented by this item using either 2D or 3D geometries. The length of the array is 2*n where n is the number of dimensions. Could also be None in the case of a null geometry.
Clears all Link instances associated with this object.
rel – If set, only clear links that match this relationship.
Clones this object.
Cloning an object will make a copy of all properties and links of the object; however, it will not make copies of the targets of links (i.e. it is not a deep copy). To copy a STACObject fully, with all linked elements also copied, use full_copy().
The clone of this object.
Collection to which this Item belongs, if any.
The Collection ID that this item belongs to, if any.
Access the item’s common metadata fields as a CommonMetadata object.
Datetime associated with this item. If None, then start_datetime and end_datetime in common_metadata will supply the datetime range of the Item.
Deletes the asset at the given key, and removes the asset’s data file from the local filesystem.
It is an error to attempt to delete an asset’s file if it is on a remote filesystem.
To delete the asset without removing the file, use del item.assets[“key”].
key – The unique key of this asset.
Accessor for extension classes on this item
Example:
item.ext.proj.code = "EPSG:4326"
Extra fields that are part of the top-level JSON fields the Item.
Parses this STACObject from the passed in dictionary.
d – The dict to parse.
href – Optional href that is the file location of the object being parsed.
root – Optional root catalog for this object. If provided, the root of the returned STACObject will be set to this parameter.
migrate – By default, STAC objects and extensions are migrated to their latest supported version. Set this to False to disable this behavior.
preserve_dict – If False, the dict parameter d may be modified during this method call. Otherwise the dict is not mutated. Defaults to True, which results results in a deepcopy of the parameter. Set to False when possible to avoid the performance hit of a deepcopy.
The STACObject parsed from this dict.
Reads a STACObject implementation from a file.
href – The HREF to read the object from.
stac_io – Optional instance of StacIO to use. If not provided, will use the default instance.
The specific STACObject implementation class that is represented by the JSON read from the file located at HREF.
Create a full copy of this STAC object and any STAC objects linked to by this object.
root – Optional root to set as the root of the copied object, and any other copies that are contained by this object.
parent – Optional parent to set as the parent of the copy of this object.
links to.
Defines the full footprint of the asset represented by this item, formatted according to RFC 7946, section 3.1 (GeoJSON).
Get this object’s assets.
media_type – If set, filter the assets such that only those with a matching media_type are returned.
role – If set, filter the assets such that only those with a matching role are returned.
media_type
and/or role if set or else all of this object’s assets.
Gets the collection of this item, if one exists.
If this item belongs to a collection, returns a reference to the collection. Otherwise returns None.
Collection or None
Gets an Item or an Asset datetime.
If an Asset is supplied and the Item property exists on the Asset, returns the Asset’s value. Otherwise returns the Item’s value.
datetime or None
Get the items that this is derived from.
Returns a reference to the derived_from items.
List[Item]
Gets the Link instances associated with this object.
rel – If set, filter links such that only those matching this relationship are returned.
media_type – If set, filter the links such that only those matching media_type are returned. media_type can be a single value or a list of values.
rel and/
or media_type if set, or else all links associated with this object.
List[Link]
Get the Catalog or Collection to the parent for this object. The root is represented by a Link with rel == 'parent'.
The parent object for this object, or None if no root link is set.
Catalog, Collection, or None
Get the Catalog or Collection to the root for this object. The root is represented by a Link with rel == 'root'.
The root object for this object, or None if no root link is set.
Catalog, Collection, or None
Get the Link representing the root for this object.
The root link for this object, or None if no root link is set.
Link or None
Gets the absolute HREF that is represented by the rel == 'self' Link.
The absolute HREF of this object, or None if there is no self link defined.
str or None
Note
A self link can exist for objects, even if the link is not read or written to the JSON-serialized version of the object. Any object read from STACObject.from_file will have the HREF the file was read from set as it’s self HREF. All self links have absolute (as opposed to relative) HREFs.
Get a single Link instance associated with this object.
rel – If set, filter links such that only those matching this relationship are returned.
media_type – If set, filter the links such that only those matching media_type are returned. media_type can be a single value or a list of values.
rel
and/or media_type, or else the first link associated with this object.
Link | None
Gets the STACObject instances that are linked to by links with their rel property matching the passed in argument.
rel – The relation to match each Link’s rel property against.
typ – If not None, objects will only be yielded if they are instances of typ.
modify_links – A function that modifies the list of links before they are iterated over. For instance, this option can be used to sort the list so that links matching a particular pattern are earlier in the iterator.
connected to this object through links with the given rel and are of type typ (if given).
Iterable[STACObject]
Provider identifier. Unique within the STAC.
A list of Link objects representing all links associated with this Item.
Modify each asset’s HREF to be absolute.
Any asset HREFs that are relative will be modified to absolute based on this item’s self HREF.
self
Modify each asset’s HREF to be relative to this object’s self HREF.
self
Returns a boolean indicating whether the given dictionary represents a valid instance of this STACObject sub-class.
d – A dictionary to identify
A dictionary of additional metadata for the Item.
Remove an item that this is derived from.
This method will remove from existing “derived_from” links.
item_id – ID of item to remove from derived_from links.
Removes all hierarchical links from this object.
See pystac.link.HIERARCHICAL_LINKS for a list of all hierarchical links. If the object has a self href and add_canonical is True, a link with rel="canonical" is added.
add_canonical – If true, and this item has a self href, that href is used to build a canonical link.
All removed links
List[Link]
Remove links to this object’s set of links that match the given rel.
rel – The Link rel to match on.
Ensure all STACObjects linked to by this STACObject are resolved. This is important for operations such as changing HREFs.
This method mutates the entire catalog tree.
Saves this STACObject to it’s ‘self’ HREF.
include_self_link – If this is true, include the ‘self’ link with this object. Otherwise, leave out the self link.
dest_href – Optional HREF to save the file to. If None, the object will be saved to the object’s self href.
stac_io – Optional instance of StacIO to use. If not provided, will use the instance set on the object’s root if available, otherwise will use the default instance.
STACError – If no self href is set, this error will be raised.
Gets the absolute HREF that is represented by the rel == 'self' Link.
ValueError – If the self_href is not set, this method will throw a ValueError. Use get_self_href if there may not be an href set.
Set the collection of this item.
This method will replace any existing Collection link and attribute for this item.
collection – The collection to set as this item’s collection. If None, will clear the collection.
self
Set an Item or an Asset datetime.
If an Asset is supplied, sets the property on the Asset. Otherwise sets the Item’s value.
Sets the parent Catalog or Collection for this object.
parent – The parent object to set. Passing in None will clear the parent.
Sets the root Catalog or Collection for this object.
root – The root object to set. Passing in None will clear the root.
Sets the absolute HREF that is represented by the rel == 'self' Link.
Changing the self HREF of the item will ensure that all asset HREFs remain valid. If asset HREFs are relative, the HREFs will change to point to the same location based on the new item self HREF, either by making them relative to the new location or making them absolute links if the new location does not share the same protocol as the old location.
href – The absolute HREF of this object. If the given HREF is not absolute, it will be transformed to an absolute HREF based on the current working directory. If this is None the call will clear the self HREF link.
List of extensions the Item implements.
Determine if target is somewhere in the hierarchical link tree of a STACObject.
target – A string or STACObject to search for
for the current STACObject
Returns this object as a dictionary.
include_self_link – If True, the dict will contain a self link to this object. If False, the self link will be omitted.
transform_hrefs – If True, transform the HREF of hierarchical links based on the type of catalog this object belongs to (if any). I.e. if this object belongs to a root catalog that is RELATIVE_PUBLISHED or SELF_CONTAINED, hierarchical link HREFs will be transformed to be relative to the catalog root.
dict – A serialization of the object.
Validate this STACObject.
Returns a list of validation results, which depends on the validation implementation. For JSON Schema validation (default validator), this will be a list of schema URIs that were used during validation.
validator – A custom validator to use for validation of the object. If omitted, the default validator from RegisteredValidator will be used instead.
An object that contains a link to data associated with an Item or Collection that can be downloaded or streamed.
href – Link to the asset object. Relative and absolute links are both allowed.
title – Optional displayed title for clients and users.
description – A description of the Asset providing additional details, such as how it was processed or created. CommonMark 0.29 syntax MAY be used for rich text representation.
media_type – Optional description of the media type. Registered Media Types are preferred. See MediaType for common media types.
roles – Optional, Semantic roles (i.e. thumbnail, overview, data, metadata) of the asset.
extra_fields – Optional, additional fields for this asset. This is used by extensions as a way to serialize and deserialize properties on asset object JSON.
Clones this asset. Makes a deepcopy of the extra_fields.
The clone of this asset.
Access the asset’s common metadata fields as a CommonMetadata object.
Copies this asset’s file to a new location on the local filesystem, setting the asset href accordingly.
Modifies the asset in place, and returns the same asset.
href – The new asset location. Must be a local path. If relative it must be relative to the owner object.
The asset with the updated href.
Delete this asset’s file. Does not delete the asset from the item that owns it. See delete_asset() for that.
Does not modify the asset.
A description of the Asset providing additional details, such as how it was processed or created. CommonMark 0.29 syntax MAY be used for rich text representation.
Accessor for extension classes on this asset
Example:
asset.ext.proj.code = "EPSG:4326"
Optional, additional fields for this asset. This is used by extensions as a way to serialize and deserialize properties on asset object JSON.
Constructs an Asset from a dict.
The Asset deserialized from the JSON dict.
Gets the absolute href for this asset, if possible.
this method will return None. If the Item that owns the Asset has no self HREF, this will also return None.
be determined.
Check if a role exists in the Asset role list.
role – Role to check for existence.
True if role exists, else False.
Link to the asset object. Relative and absolute links are both allowed.
Optional description of the media type. Registered Media Types are preferred. See MediaType for common media types.
Moves this asset’s file to a new location on the local filesystem, setting the asset href accordingly.
Modifies the asset in place, and returns the same asset.
href – The new asset location. Must be a local path. If relative it must be relative to the owner object.
The asset with the updated href.
The Item or Collection that this asset belongs to, or None if it has no owner.
Optional, Semantic roles (i.e. thumbnail, overview, data, metadata) of the asset.
Sets the owning item of this Asset.
The owning item will be used to resolve relative HREFs of this asset.
obj – The Collection or Item that owns this asset.
Optional displayed title for clients and users.
Returns this Asset as a dictionary.
A serialization of the Asset.
Implementation of the Item Asset Definition Object for use as values in the item_assets dict.
Sets the properties for this asset definition.
title – Displayed title for clients and users.
description – Description of the Asset providing additional details, such as how it was processed or created. CommonMark 0.29 syntax MAY be used for rich text representation.
media_type – media type of the asset.
roles – semantic roles of the asset, similar to the use of rel in links.
extra_fields – Additional fields on the asset definition, e.g. from extensions.
Creates a new asset definition.
title – Displayed title for clients and users.
description – Description of the Asset providing additional details, such as how it was processed or created. CommonMark 0.29 syntax MAY be used for rich text representation.
media_type – media type of the asset.
roles – semantic roles of the asset, similar to the use of rel in links.
extra_fields – Additional fields on the asset definition, e.g. from extensions.
Creates a new Asset instance using the fields from this ItemAssetDefinition and the given href.
Gets or sets a description of the Asset providing additional details, such as how it was processed or created. CommonMark 0.29 syntax MAY be used for rich text representation.
Accessor for extension classes on this item_asset
Example:
collection.item_assets["data"].ext.proj.epsg = 4326
Gets or sets the media type of the asset.
Gets or sets the semantic roles of the asset, similar to the use of rel in links.
Sets the owning item of this ItemAssetDefinition.
The owning item will be used to resolve relative HREFs of this asset.
obj – The Collection that owns this asset.
Gets or sets the displayed title for clients and users.
Returns a dictionary representing this ItemAssetDefinition.
Object containing fields that are not included in core item schema but are still commonly used. All attributes are defined within the properties of this item and are optional
properties – Dictionary of attributes that is the Item’s properties
Gets or set the name of the constellation associate with an object.
Get or set the metadata file’s creation date. All datetime attributes have setters that can take either a string or a datetime, but always stores the attribute as a string.
Note
created has a different meaning depending on the type of STAC object. On an Item, it refers to the creation time of the metadata. On an Asset, it refers to the creation time of the actual data linked to in href.
Gets or set the object’s description.
Get or set the item’s end_datetime.
Note
end_datetime is an inclusive datetime.
Gets or sets the Ground Sample Distance at the sensor.
Gets or sets the names of the instruments used.
Get or set the keywords describing the STAC entity.
Get or set the current license. License should be provided as a SPDX License identifier, or other. If object includes data with multiple different licenses, use other and add a link for each.
Note
The licenses various and proprietary are deprecated.
Gets or set the name of the mission associated with an object.
The object from which common metadata is obtained.
Gets or set the object’s platform attribute.
Get or set a list of the object’s providers.
Get or set the semantic roles of the entity.
Get or set the object’s start_datetime.
Note
start_datetime is an inclusive datetime.
Gets or set the object’s title.
Get or set the metadata file’s update date. All datetime attributes have setters that can take either a string or a datetime, but always stores the attribute as a string
Note
updated has a different meaning depending on the type of STAC object. On an Item, it refers to the update time of the metadata. On an Asset, it refers to the update time of the actual data linked to in href.
Implementation of a GeoJSON FeatureCollection whose features are all STAC Items, as defined by STAC API - ItemCollection Fragment.
All Item instances passed to the ItemCollection instance during instantiation are cloned and have their "root" URL cleared. Instances of this class implement the abstract methods of typing.Collection and can also be added together (see below for examples using these methods).
Any additional top-level fields in the FeatureCollection are retained in extra_fields by the from_dict() and from_file() methods and will be present in the serialized file from save_object().
items – List of Item instances to include in the ItemCollection.
extra_fields – Dictionary of additional top-level fields included in the ItemCollection.
clone_items – Optional flag indicating whether Item instances should be cloned before storing in the ItemCollection. Setting to False will result in faster instantiation, but changes made to Item instances in the ItemCollection will mutate the original Item. Defaults to True.
Examples
Loop over all items in the :class`ItemCollection`
>>> item_collection: ItemCollection = ... >>> for item in item_collection: ... ...
Get the number of Item instances in the ItemCollection
>>> length: int = len(item_collection)
Check if an Item is in the ItemCollection. Note that the clone_items argument must be False for this to return True, since equality of PySTAC objects is currently evaluated using default object equality (i.e. item_1 is item_2).
>>> item: Item = ... >>> item_collection = ItemCollection(items=[item], clone_items=False) >>> assert item in item_collection
Combine ItemCollection instances
>>> item_1: Item = ... >>> item_2: Item = ... >>> item_3: Item = ... >>> item_collection_1 = ItemCollection(items=[item_1, item_2]) >>> item_collection_2 = ItemCollection(items=[item_2, item_3]) >>> combined = item_collection_1 + item_collection_2 >>> assert len(combined) == 4 # If an item is present in both ItemCollections it will occur twice
Creates a clone of this instance. This clone is a deep copy; all Item instances are cloned and all additional top-level fields are deep copied.
Dictionary of additional top-level fields for the GeoJSON FeatureCollection.
Creates a ItemCollection instance from a dictionary.
d – The dictionary from which the ItemCollection will be created
preserve_dict – If False, the dict parameter d may be modified during this method call. Otherwise the dict is not mutated. Defaults to True, which results results in a deepcopy of the parameter. Set to False when possible to avoid the performance hit of a deepcopy.
Reads a ItemCollection from a JSON file.
href – Path to the file.
stac_io – A StacIO instance to use for file I/O
Checks if the given dictionary represents a valid ItemCollection.
d – Dictionary to check
List of pystac.Item instances contained in this ItemCollection.
Saves this instance to the dest_href location.
dest_href – Location to which the file will be saved.
stac_io – Optional StacIO instance to use. If not provided, will use the default instance.
Serializes an ItemCollection instance to a dictionary.
transform_hrefs – If True, transform the HREF of hierarchical links of Items based on the type of catalog the Item belongs to (if any). I.e. if the item belongs to a root catalog that is RELATIVE_PUBLISHED or SELF_CONTAINED, hierarchical link HREFs will be transformed to be relative to the catalog root. This can be slow if the Items have root links that have not yet been resolved. Defaults to False.
A link connects a STACObject to another entity.
The target of a link can be either another STACObject, or an HREF. When serialized, links always refer to the HREF of the target. Links are lazily deserialized - this is, when you read in a link, it does not automatically load in the STACObject that is the target (if the link is pointing to a STACObject). When a user is crawling through a catalog or when additional metadata is required, PySTAC uses the resolve_stac_object() method to load in and deserialize STACObjects. This mechanism is used within the PySTAC codebase and normally does not need to be considered by the user - ideally the lazy deserialization of STACObjects is transparent to clients of PySTAC.
rel – The relation of the link (e.g. ‘child’, ‘item’). Registered rel Types are preferred. See RelType for common media types.
target – The target of the link. If the link is unresolved, or the link is to something that is not a STACObject, the target is an HREF. If resolved, the target is a STACObject.
media_type – Optional description of the media type. Registered Media Types are preferred. See MediaType for common media types.
title – Optional title for this link.
extra_fields – Optional, additional fields for this link. This is used by extensions as a way to serialize and deserialize properties on link object JSON.
Returns the absolute HREF for this link.
If the href is None, this will throw an exception. Use get_absolute_href if there may not be an href set.
Creates a canonical link to an Item or Collection.
Creates a link to a child Catalog or Collection.
Clones this link.
This makes a copy of all link information, but does not clone a STACObject if one is the target of this link.
The cloned link.
Creates a link to a Collection.
Creates a link to a derived_from Item.
Accessor for extension classes on this link
Example:
link.ext.file.size = 8675309
Optional, additional fields for this link. This is used by extensions as a way to serialize and deserialize properties on link object JSON.
Deserializes a Link from a dict.
d – The dict that represents the Link in JSON
Link instance constructed from the dict.
Gets the absolute href for this link, if possible.
Returns this link’s HREF. It attempts to derive an absolute HREF from this link; however, if the link is relative, has no owner, and has an unresolved target, this will return a relative HREF.
Gets the HREF for this link.
transform_href – If True, transform the HREF based on the type of catalog the owner belongs to (if any). I.e. if the link owner belongs to a root catalog that is RELATIVE_PUBLISHED or SELF_CONTAINED, the HREF will be transformed to be relative to the catalog root if this is a hierarchical link relation.
Returns this link’s HREF. If there is an owner of the link and the root catalog (if there is one) is of type RELATIVE_PUBLISHED, then the HREF returned will be relative. In all other cases, this method will return an absolute HREF.
Returns this link’s target as a string.
If a string href was provided, returns that. If not, tries to resolve the self link of the target object.
Returns true if this link has a string href in its target information.
Returns the HREF for this link.
If the href is None, this will throw an exception. Use get_href if there may not be an href.
Returns true if this link’s rel type is hierarchical.
Hierarchical links are used to build relationships in STAC, e.g. “parent”, “child”, “item”, etc. For a complete list of hierarchical relation types, see HIERARCHICAL_LINKS.
True if the link’s rel type is hierarchical.
Determines if the link’s target is a resolved STACObject.
True if this link is resolved.
Creates a link to an Item.
Optional description of the media type. Registered Media Types are preferred. See MediaType for common media types.
The owner of this link. The link will use its owner’s root catalog ResolvedObjectCache to resolve objects, and will create absolute HREFs from relative HREFs against the owner’s self HREF.
Creates a link to a parent Catalog or Collection.
The relation of the link (e.g. ‘child’, ‘item’). Registered rel Types are preferred. See RelType for common media types.
Resolves a STAC object from the HREF of this link, if the link is not already resolved.
root – Optional root of the catalog for this link. If provided, the root’s resolved object cache is used to search for previously resolved instances of the STAC object.
Creates a link to a root Catalog or Collection.
Creates a self link to a file’s location.
Sets the owner of this link.
owner – The owner of this link. Pass None to clear.
The target of the link. If the link is unresolved, or the link is to something that is not a STACObject, the target is an HREF. If resolved, the target is a STACObject.
Optional title for this link. If not provided during instantiation, this will attempt to get the title from the STAC object that the link references.
Returns this link as a dictionary.
transform_href – If True, transform the HREF based on the type of catalog the owner belongs to (if any). I.e. if the link owner belongs to a root catalog that is RELATIVE_PUBLISHED or SELF_CONTAINED, the HREF will be transformed to be relative to the catalog root if this is a hierarchical link relation.
A serialization of the Link.
A list of common media types that can be used in STAC Asset and Link metadata.
A list of common rel types that can be used in STAC Link metadata. See “Using Relation Types in the STAC Best Practices for guidelines on using relation types. You may also want to refer to the “Relation type” documentation for Catalogs, Collections, or Items for relation types specific to those STAC objects.
Method used internally by StacIO instances to serialize a dictionary to a JSON string.
This method may be overwritten in StacIO sub-classes to provide custom serialization logic. The method accepts arbitrary keyword arguments. These are not used by the default implementation, but may be used by sub-class implementations.
json_dict – The dictionary to serialize
Method used internally by StacIO instances to deserialize a dictionary from a JSON string.
This method may be overwritten in StacIO sub-classes to provide custom deserialization logic. The method accepts arbitrary keyword arguments. These are not used by the default implementation, but may be used by sub-class implementations.
txt – The JSON string to deserialize to a dictionary.
Read a dict from the given source.
See StacIO.read_text for usage of str vs Link as a parameter.
source – The source from which to read.
*args – Additional positional arguments to be passed to StacIO.read_text().
**kwargs – Additional keyword arguments to be passed to StacIO.read_text().
A dict representation of the JSON contained in the file at the given source.
Read a STACObject from a JSON file at the given source.
See StacIO.read_text for usage of str vs Link as a parameter.
source – The source from which to read.
root – Optional root of the catalog for this object. If provided, the root’s resolved object cache can be used to search for previously resolved instances of the STAC object.
*args – Additional positional arguments to be passed to StacIO.read_json().
**kwargs – Additional keyword arguments to be passed to StacIO.read_json().
The deserialized STACObject from the serialized JSON contained in the file at the given uri.
Read text from the given URI.
The source to read from can be specified as a string or os.PathLike object (Link is a path-like object). If it is a string, it must be a URI or local path from which to read. Using a Link enables implementations to use additional link information, such as paging information contained in the extended links described in the STAC API spec.
source – The source to read from.
*args – Arbitrary positional arguments that may be utilized by the concrete implementation.
**kwargs – Arbitrary keyword arguments that may be utilized by the concrete implementation.
The text contained in the file at the location specified by the uri.
Write a dict to the given URI as JSON.
See StacIO.write_text for usage of str vs Link as a parameter.
dest – The destination file to write the text to.
json_dict – The JSON dict to write.
*args – Additional positional arguments to be passed to StacIO.json_dumps().
**kwargs – Additional keyword arguments to be passed to StacIO.json_dumps().
Set the default StacIO instance to use.
Deserializes a STACObject sub-class instance from a dictionary.
d – The dictionary to deserialize
href – Optional href to associate with the STAC object
root – Optional root Catalog to associate with the STAC object.
preserve_dict – If False, the dict parameter d may be modified during this method call. Otherwise the dict is not mutated. Defaults to True, which results results in a deepcopy of the parameter. Set to False when possible to avoid the performance hit of a deepcopy.
Write the given text to a file at the given URI.
The destination to write to can be specified as a string or os.PathLike object (Link is a path-like object). If it is a string, it must be a URI or local path from which to read. Using a Link enables implementations to use additional link information.
dest – The destination to write to.
txt – The text to write.
A STACError is raised for errors relating to STAC, e.g. for invalid formats or trying to operate on a STAC that does not have the required information available.
A STACTypeError is raised when encountering a representation of a STAC entity that is not correct for the context; for example, if a Catalog JSON was read in as an Item.
Raised when deserializing a JSON object containing a duplicate key.
An ExtensionAlreadyExistsError is raised when extension hooks are registered with PySTAC if there are already hooks registered for an extension with the same ID.
An ExtensionTypeError is raised when an extension is used against an object that the extension does not apply to
Attempted to extend a STAC object that does not implement the given extension.
This error is raised when a required value was expected to be there but was missing or None. This will happen, for example, in an extension that has required properties, where the required property is missing from the extended object
obj – Description of the object that will have a property missing. Should include a __repr__ that identifies the object for the error message, or be a string that describes the object.
prop – The property that is missing
Represents a validation error. Thrown by validation calls if the STAC JSON is invalid.
source – Source of the exception. Type will be determined by the validation implementation. For the default JsonSchemaValidator this will a the jsonschema.ValidationError.
Exception thrown when an error occurs during converting a template string into data for LayoutTemplate
Issued when converting a dictionary to a STAC Item or Collection and the version extension deprecated field is present and set to True.
RetroSearch is an open source project built by @garambo | Open a GitHub Issue
Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo
HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4