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

Ivan Grcic igrcic at gmail.com
Wed Feb 3 09:54:09 EST 2010

Hi, issuing getfeatureinfo on raster layer in geoserver returns pixel
value of clicked point. Dont know if that is standard or not though...

On Sun, Jan 31, 2010 at 11:45 AM, Mårten Karlberg
<mortkarlberg at gmail.com> 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?
> (Sorry if this topic has been discussed before, but the mailing list search
> engine only return error 500).
> Thanks in advance!
> /Mort Karlberg, Sweden
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Ivan Grcic

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