[Geotools-gt2-users] Retrieving Pixel Data

[agawrons <ale...@gm...>]

I'm new to geomatics and GeoTools so this might be a silly question, but I'm
really stuck. I want to extract pixel data from a geoTiff image as a double
array but no matter what I try, all I get are zeros. 

Here is my code:

File file = new File("./input/ASAR_04232010.tif");    
			
AbstractGridFormat format = GridFormatFinder.findFormat(file);
AbstractGridCoverage2DReader reader = format.getReader(file);
			    
GridCoverage2D coverage = reader.read(null);
			
RenderedImage rendImage = coverage.getRenderedImage();
Raster raster = rendImage.getData();
Envelope2D dim = coverage.getEnvelope2D();
double[] array = new double[100];
array = raster.getPixels((int)dim.x + 1, (int)dim.y + 1, 100, 0, array);
		    
for(double num : array){
     System.out.println(num + "");
}

I tried a different file and got the same result. Unfortunately the files
are too large to attach. 

Thanks in advance!
Alex

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