Contents
Is it possible to cache tiles in OpenLayers?
Since tiled layers (such as the WMS layer) make requests for images on a regular grid, it is possible for the server to cache these image requests and return the cached result next time you (or someone else) visits the same area – resulting in better performance all around. 3.2.1. OpenLayers.Layer.XYZ ¶
How to access openlayers.layer.osm constructor?
The OpenLayers.Layer.OSM constructor accesses OpenStreetMap tiles. Open the map.html file from the previous section in a text editor and change the map initialization code to look like the following: In the of the same document, add a few style declarations for the layer attribution.
What is the attribution control in OpenLayers workshop?
By default, an OpenLayers.Control.Attribution control is added to all maps. This lets layers display attribution information in the map viewport. The declarations above alter the style of this attribution for our map (notice the small Copyright line at the bottom left of the map).
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.
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.
Is it possible to cache images in a browser?
While your browser will cache some requested images, a lot of processing work is typically required for the server to dynamically render images.