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OpenLayers v10.6.1 API - Class: VectorTile

This documentation is for OpenLayers v

. The

is v

.

import VectorTile from 'ol/source/VectorTile.js';

Class for layer sources providing vector data divided into a tile grid, to be used with VectorTileLayer. Although this source receives tiles with vector features from the server, it is not meant for feature editing. Features are optimized for rendering, their geometries are clipped at or near tile boundaries and simplified for a view resolution. See VectorSource for vector sources that are suitable for feature editing.

Name Type Description attributions AttributionLike | undefined

Attributions.

attributionsCollapsible boolean (defaults to true)

Attributions are collapsible.

cacheSize number | undefined

Initial tile cache size. Will auto-grow to hold at least twice the number of tiles in the viewport.

extent Extent | undefined

Extent.

format FeatureFormat<FeatureType> | undefined

Feature format for tiles. Used and required by the default.

overlaps boolean (defaults to true)

This source may have overlapping geometries. Setting this to false (e.g. for sources with polygons that represent administrative boundaries or TopoJSON sources) allows the renderer to optimise fill and stroke operations.

projection ProjectionLike (defaults to 'EPSG:3857')

Projection of the tile grid.

state State | undefined

Source state.

tileClass Class<VectorTile> | undefined

Class used to instantiate tiles. Default is VectorTile.

maxZoom number (defaults to 22)

Optional max zoom level. Not used if tileGrid is provided.

minZoom number | undefined

Optional min zoom level. Not used if tileGrid is provided.

tileSize number | Size (defaults to 512)

Optional tile size. Not used if tileGrid is provided.

maxResolution number | undefined

Optional tile grid resolution at level zero. Not used if tileGrid is provided.

tileGrid TileGrid | undefined

Tile grid.

tileLoadFunction LoadFunction | undefined

Optional function to load a tile given a URL. Could look like this for pbf tiles:

function(tile, url) {
  tile.setLoader(function(extent, resolution, projection) {
    fetch(url).then(function(response) {
      response.arrayBuffer().then(function(data) {
        const format = tile.getFormat() // ol/format/MVT configured as source format
        const features = format.readFeatures(data, {
          extent: extent,
          featureProjection: projection
        });
        tile.setFeatures(features);
      });
    });
  });
}

If you do not need extent, resolution and projection to get the features for a tile (e.g. for GeoJSON tiles), your tileLoadFunction does not need a setLoader() call. Only make sure to call setFeatures() on the tile:

const format = new GeoJSON({featureProjection: map.getView().getProjection()});
async function tileLoadFunction(tile, url) {
  const response = await fetch(url);
  const data = await response.json();
  tile.setFeatures(format.readFeatures(data));
}

tileUrlFunction UrlFunction | undefined

Optional function to get tile URL given a tile coordinate and the projection.

url string | undefined

URL template. Must include {x}, {y} or {-y}, and {z} placeholders. A {?-?} template pattern, for example subdomain{a-f}.domain.com, may be used instead of defining each one separately in the urls option.

transition number | undefined

A duration for tile opacity transitions in milliseconds. A duration of 0 disables the opacity transition.

urls Array.<string> | undefined

An array of URL templates.

wrapX boolean (defaults to true)

Whether to wrap the world horizontally. When set to false, only one world will be rendered. When set to true, tiles will be wrapped horizontally to render multiple worlds.

zDirection number | NearestDirectionFunction (defaults to 1)

Choose whether to use tiles with a higher or lower zoom level when between integer zoom levels. See getZForResolution.

Fires:

• change (BaseEvent) - Generic change event. Triggered when the revision counter is increased.
• error (BaseEvent) - Generic error event. Triggered when an error occurs.
• propertychange (ObjectEvent) - Triggered when a property is changed.
• tileloadend (TileSourceEvent) - Triggered when a tile finishes loading, either when its data is loaded, or when loading was aborted because the tile is no longer needed.
• tileloaderror (TileSourceEvent) - Triggered if tile loading results in an error. Note that this is not the right place to re-fetch tiles. See load for details.
• tileloadstart (TileSourceEvent) - Triggered when a tile starts loading.

• OGCVectorTile

• UrlTile

Increases the revision counter and dispatches a 'change' event.

Remove all cached reprojected tiles from the source. The next render cycle will create new tiles.

dispatchEvent(event){boolean | undefined} inherited

Dispatches an event and calls all listeners listening for events of this type. The event parameter can either be a string or an Object with a type property.

Name Type Description event BaseEvent | string

Event object.

Returns:false if anyone called preventDefault on the event object or if any of the listeners returned false.

Gets a value.

Name Type Description key string

Key name.

Returns: Value.

Get the attribution function for the source.

Returns: Attribution function.

getAttributionsCollapsible(){boolean} inherited

Returns: Attributions are collapsible.

Get a list of object property names.

Returns: List of property names.

Get the projection of the source.

Returns: Projection.

getProperties(){Object.<string, *>} inherited

Get an object of all property names and values.

Returns: Object.

Get the version number for this object. Each time the object is modified, its version number will be incremented.

Returns: Revision.

Get the state of the source, see State for possible states.

Returns: State.

Return the tile grid of the tile source.

Returns: Tile grid.

Deprecated. Use an ImageTile source instead. Return the tile load function of the source.

Returns: TileLoadFunction

Deprecated. Use an ImageTile source instead. Return the tile URL function of the source.

Returns: TileUrlFunction

Deprecated. Use an ImageTile source instead. Return the URLs used for this source. When a tileUrlFunction is used instead of url or urls, null will be returned.

Returns: URLs.

Listen for a certain type of event.

Name Type Description type string | Array.<string>

The event type or array of event types.

listener function

The listener function.

Returns: Unique key for the listener. If called with an array of event types as the first argument, the return will be an array of keys.

Listen once for a certain type of event.

Name Type Description type string | Array.<string>

The event type or array of event types.

listener function

The listener function.

Returns: Unique key for the listener. If called with an array of event types as the first argument, the return will be an array of keys.

Sets a value.

Name Type Description key string

Key name.

value *

Value.

silent boolean | undefined

Update without triggering an event.

Set the attributions of the source.

Name Type Description attributions AttributionLike | undefined

Attributions. Can be passed as string, Array<string>, Attribution, or undefined.

Sets a collection of key-value pairs. Note that this changes any existing properties and adds new ones (it does not remove any existing properties).

Name Type Description values Object.<string, *>

Values.

silent boolean | undefined

Update without triggering an event.

setTileLoadFunction(tileLoadFunction) inherited

Deprecated. Use an ImageTile source instead. Set the tile load function of the source.

Name Type Description tileLoadFunction LoadFunction

Tile load function.

setTileUrlFunction(tileUrlFunction, key) inherited

Deprecated. Use an ImageTile source instead. Set the tile URL function of the source.

Name Type Description tileUrlFunction UrlFunction

Tile URL function.

key string | undefined

Optional new tile key for the source.

Set the URL to use for requests.

Name Type Description url string

URL.

Deprecated. Use an ImageTile source instead. Set the URLs to use for requests.

Name Type Description urls Array.<string>

URLs.

Unlisten for a certain type of event.

Name Type Description type string | Array.<string>

The event type or array of event types.

listener function

The listener function.

Unsets a property.

Name Type Description key string

Key name.

silent boolean | undefined

Unset without triggering an event.

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