[OpenLayers-Dev] Get individual pixel values of wms-grid raster layers?

Eric Lemoine eric.lemoine at camptocamp.com
Tue Feb 2 02:02:19 EST 2010

On Sunday, January 31, 2010, Mårten Karlberg  wrote:
> Hello!
> Is it possible to access pixel values of wms-grid raster layers in OpenLayers? What I want to do is to extract pixel values from a raster layer where it intersect with a vector overlay.
> I've tried figuring out the grid tile raster structure through the DOM tree, but just don't get it.
> Is this possible? If I understand HTML5 right something like this could be achieved through the Canvas element (see e.g. http://www.pixastic.com/lib/), but can it be done now, in present versions of OpenLayers?


You may be interested in this demo:


Eric Lemoine

Camptocamp France SAS
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Tel : 00 33 4 79 44 44 96
Mail : eric.lemoine at camptocamp.com

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