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
>
> ---------------------------
> //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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