code: protected Double getBilinearInterpolationValue(
  			CoverageDataSourcePixel sourcePixelX,
  			CoverageDataSourcePixel sourcePixelY, Double[][] values) {
  		return getBilinearInterpolationValue(sourcePixelX.getOffset(),
  				sourcePixelY.getOffset(), sourcePixelX.getMin(),
  				sourcePixelX.getMax(), sourcePixelY.getMin(),
  				sourcePixelY.getMax(), values);
  	}
docs: Get the Bilinear Interpolation coverage data value
  
  @param sourcePixelX
  source pixel x
  @param sourcePixelY
  source pixel y
  @param values
  2 x 2 coverage data values as [y][x]
  @return coverage data value