layer/Layer.js, line 236 Sets the layer to be rendered on top of other layers on a map. Layers are stored as a module:ol/Collection~Collection in layerGroups. Information about countries is shown on hover and click. A top-level group is provided by the library. These layers do not control the zoom levels of the map, but can be enabled or disabled at certain scales by min/max scale/resolution parameters so that they are only enabled at a certain level. OpenLayers has been developed to further the use of geographic information of all kinds. OpenLayers makes it easy to put a dynamic map in any web page. Multiple non-base layer can be enabled at a time. This is what is accessed by getLayerGroup and setLayerGroup. It is completely free, Open Source JavaScript, released under the 2-clause BSD License (also known as the FreeBSD). It can display map tiles, vector data and markers loaded from any source. Layers entered in the options are added to this group, and addLayer and removeLayer change the layer collection in … In the context of a layer switcher, however, the distinction of base vs. overlay layers is useful, because it helps make the switcher saner. Non base layers – sometimes called overlays – are the alternative to Base Layers. WMTS Layer from Capabilities (wmts-layer-from-capabilities.html) Example of a WMTS source created from a WMTS capabilities document. The countries are loaded from a GeoJSON file. The map will not manage this layer in its layers collection, and the callback in module:ol/Map#forEachLayerAtPixel will receive null as layer. Example of a countries vector layer with country information.

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