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How are base layers different in OpenLayers 2?
This difference controls several aspects of how you interact with an OpenLayers 2 Map. Base Layers are mutually exclusive layers, meaning only one can be enabled at any given time. The currently active base layer determines the available projection (coordinate system) and zoom levels available on the map.
What happens when you set alloverlays to true in OpenLayers?
In addition, if set to true, all layers will have isBaseLayer set to false when they are added to the map. If you set map.allOverlays to true, then you cannot use map.setBaseLayer or layer.setIsBaseLayer. With allOverlays true, the lowest layer in the draw layer is the base layer.
Is the isbaselayer property set to true in raster?
Most raster layers have the isBaseLayer property set to true by default. It can be changed in the layer options. Base Layers always display below overlay layers. Non base layers – sometimes called overlays – are the alternative to Base Layers. Multiple non-base layer can be enabled at a time.
Do you have to add base to layerswitcher?
For this reason, Matt Walker’s LayerSwitcher requires you to add type: ‘base’ to any layer that you want to act as “base” layer. So take this example, where we have two “base” layers and two “overlay” layers:
How is the GML layer used in OpenLayers?
The GML layer is a vector layer subclass designed to read data from a file once and display it. It is ideal for working with many formats, not just GML, and can be configured to read other formats via the ‘format’ option on the layer. The simplest use case of the GML layer is simply to load a GML file.
Which is better the WMS or the MapServer layer?
In general, the WMS Layer is preferred over the MapServer Layer. Since MapServer exposes most of its CGI functionality in WMS mode as well, the WMS layer is preferred. The MapServer layer can often lead to maps which seem to work, but don’t due to projection issues or other similar misconfigurations.
What do you need to know about overlay layers?
The Overlay Layers tool requires two inputs: an input layer and an overlay layer. The availability of overlay method options depends on whether the input and overlay layers are points, lines, or areas. The type of result features will depend on the overlay method and inputs.
How to use foreachfeatureatpixel in OpenLayers 3?
Using OSM layer and MapQuest layers to create a map 4.3. Creating a Stamen layer 4.4. Creating a Bing Maps layer 4.5. Creating tiles and adding Zoomify layer 4.6. Playing with various sources and layers together 4.7.
How to reproject vector layers in OpenLayers 3?
Introducing ol.Overlay with a static example 8.6. Using ol.Overlay dynamically with layers information 8.7. Using ol.interaction.Draw to share new information on the Web 8.8. Using ol.interaction.Modify to update drawing 8.9.