code: public Double getValue(GriddedTile griddedTile, int unsignedPixelValue) {
  
  		Double value = null;
  		if (!isDataNull(unsignedPixelValue)) {
  			value = pixelValueToValue(griddedTile, new Double(
  					unsignedPixelValue));
  		}
  
  		return value;
  	}
docs: Get the coverage data value for the unsigned short pixel value
  
  @param griddedTile
  gridded tile
  @param unsignedPixelValue
  pixel value as an unsigned 16 bit integer
  @return coverage data value