code: public Double[] getValues(GriddedTile griddedTile, BufferedImage image) {
  		short[] pixelValues = getPixelValues(image);
  		Double[] values = getValues(griddedTile, pixelValues);
  		return values;
  	}
docs: Get the coverage data values
  
  @param griddedTile
  gridded tile
  @param image
  tile image
  @return coverage data values