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Showing content from https://eomaps.readthedocs.io/en/dev/user_guide/map_features/api_webmaps.html below:

🛰 WebMap layers — EOmaps documentation

Contents:

• Add WebMap services to a map

• Pre-defined WebMap services

• Custom WebMap services

• Setting WebMap properties

WebMap services (TS/WMS/WMTS) can be attached to the map via Maps.add_wms()

m.add_wms.attach.< SERVICE > ... .add_layer.< LAYER >(...)

< SERVICE > hereby specifies the pre-defined WebMap service you want to add, and < LAYER > indicates the actual layer-name.

m = Maps(Maps.CRS.GOOGLE_MERCATOR) # (the native crs of the service)
m.add_wms.OpenStreetMap.add_layer.default()

Note

It is highly recommended (and sometimes even required) to use the native crs of the WebMap service in order to avoid re-projecting the images (which degrades image quality and sometimes takes quite a lot of time to finish…)

• most services come either in epsg=4326 or in Maps.CRS.GOOGLE_MERCATOR projection

from eomaps import MapsGrid
mg = MapsGrid(crs=Maps.CRS.GOOGLE_MERCATOR)
mg.join_limits()

mg.m_0_0.add_wms.OpenStreetMap.add_layer.default()
mg.m_0_1.add_wms.OpenStreetMap.add_layer.stamen_toner()

mg.m_1_1.add_wms.S1GBM.add_layer.vv()

# ... for more advanced
layer = mg.m_1_0.add_wms.ISRIC_SoilGrids.nitrogen.add_layer.nitrogen_0_5cm_mean
layer.set_extent_to_bbox() # set the extent according to the boundingBox
layer.info                 # the "info" property provides useful information on the layer
layer()                    # call the layer to add it to the map
layer.add_legend()         # if a legend is provided, you can add it to the map!

Global:

Services specific for Austria (Europe)

Note

Services might be nested directory structures! The actual layer is always added via the add_layer directive.

m.add_wms.<...>. ... .<...>.add_layer.<LAYER NAME>()

Some of the services dynamically fetch the structure via HTML-requests. Therefore it can take a short moment before autocompletion is capable of showing you the available options! A list of available layers from a sub-folder can be fetched via:

m.add_wms.<...>. ... .<LAYER NAME>.layers

It is also possible to use custom WMS/WMTS/XYZ services. (see docstring of get_service() for more details and examples)

m = Maps()
# define the service
service = m.add_wms.get_service(<... link to GetCapabilities.xml ...>,
                                service_type="wms",
                                res_API=False,
                                maxzoom=19)
# once the service is defined, you can use it just like the pre-defined ones
service.layers   # >> get a list of all layers provided by the service

# select one of the layers
layer = service.add_layer. ... .< LAYER >
layer.info                  # >> get some additional infos for the selected layer
layer.set_extent_to_bbox()  # >> set the map-extent to the bbox of the layer

# call the layer to add it to the map
# (optionally providing additional kwargs for fetching map-tiles)
layer(...)

Some WebMap services allow passing additional arguments to set properties such as the date or the style of the map. To pass additional arguments to a WebMap service, simply provide them when when calling the layer, e.g.:

m = Maps()
m.add_wms.< SERVICE >. ... .add_layer.< LAYER >(time=..., styles=[...], ...)

To show an example, here’s how to fetch multiple timestamps for the UV-index of the Copernicus Airquality service. (provided by https://atmosphere.copernicus.eu/)

from eomaps import Maps
import pandas as pd

m = Maps(layer="all", figsize=(8, 4))
m.subplots_adjust(left=0.05, right=0.95)
m.all.add_feature.preset.coastline()
m.add_logo()

layer = m.add_wms.CAMS.add_layer.composition_uvindex_clearsky
timepos = layer.wms_layer.timepositions   # available time-positions
all_styles = list(layer.wms_layer.styles) # available styles

# create a list of timestamps to fetch
start, stop, freq = timepos[1].split(r"/")
times = pd.date_range(start, stop, freq=freq.replace("PT", ""))
times = times.strftime("%Y-%m-%dT%H:%M:%SZ")

style = all_styles[0]     # use the first available style
for time in times[:6]:
    # call the layer to add it to the map
    layer(time=time,
          styles=[style],   # provide a list with 1 entry here
          layer=time        # put each WebMap on an individual layer
          )

layer.add_legend()  # add a legend for the WebMap service

# add a "slider" and a "selector" widget
m.util.layer_selector(ncol=3, loc="upper center", fontsize=6, labelspacing=1.3)
m.util.layer_slider()

# attach a callback to fetch all layers if you press l on the keyboard
cid = m.all.cb.keypress.attach.fetch_layers(key="l")
# fetch all layers so that they are cached and switching layers is fast
m.fetch_layers()
m.show_layer(times[0])      # make the first timestamp visible

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