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Re: [udig-users] Getting raster data from a wms layer
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I would ask on the GeoServer list if getInfo could be hooked up to
work for raster layers. Have you tried the info tool? It retrieves
information from a WMS about the layer(s) the user has clicked on - it
is covered in walkthrough 1.
Other then the GetInfo operation the WMS specification does not
provide any facilities for performing a query.
Jody
On 03/09/2009, at 1:55 AM, Devrim Baris Acar wrote:
Hi,
I have setup a geoserver which serves nasa srtm30 bathymetry
elevation data(geotiff) in pyramids.
I have added this as a wms layer to udig but stuck on the point to
read the raster value on a mouse clicked point.
For a local geotiff file, the following code seems to work ok but I
dont know what should I do for a wms layer as its georesource is not
of GridCoverage2D class.
What should I do to access raster data values on a wms (or wmsc)
layer?
Best regards,
Devrim Baris Acar
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//works for local geotiff
public float getElevationOfPoint2(int x, int y) {
ILayer layer = getContext().getMapLayers().get(0);
GridCoverage2D geoRes = null;
try {
geoRes = (GridCoverage2D) layer.getGeoResource().resolve(
GridCoverage.class, new NullProgressMonitor());
} catch (IOException e) {
e.printStackTrace();
}
DirectPosition dp = new DirectPosition2D
(geoRes.getCoordinateReferenceSystem(), start.x, start.y); // start
is of type Coordinate
int[] evaluate = (int[]) (geoRes.evaluate(dp));
return new Float(evaluate[0]);
}
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