[udig-users] getting elevation of a coordinate from a geotiff

[Devrim Baris Acar <devrimbaris@xxxxxxxxx>]

Hi,
I am trying to read the elevation of the coordinate the mouse cursor is located. I have not been successful although I am trying for a couple of days.

I am using Udig 1.2m6 on a windows machine, customizing the Distancetool example. I have opened a srtm30(bathymetry) geotiff.

I have tried the following code to get the gray scale byte value of the mouse position

---------------------------
public float getElevationOfPoint(int x, int y){

        int[] intarr = null;
        RenderedImage image = getContext().getRenderManager().getImage();

        Raster raster = image.getData();
        DataBufferByte dbb = (DataBufferByte)raster.getDataBuffer();
        PixelInterleavedSampleModel sampleModel = (PixelInterleavedSampleModel) raster.getSampleModel();

        int[] samples = sampleModel.getPixel(x, y, intarr, dbb);
        return samples[0];
        
    }
---------------------

But this just returns value between 0-255 as expected. How can I get the real elevation at the mouse cursor point?

Any pointers?

Best regards,
-- 
Devrim Baris Acar