code: def raster_binarization(given_value, rasterfilename):
          
          origin_raster = RasterUtilClass.read_raster(rasterfilename)
          binary_raster = numpy.where(origin_raster.data == given_value, 1, 0)
          return binary_raster
docs: Make the raster into binarization.
  
          The opening and closing are based on binary image. Therefore we need to
          make the raster into binarization.
  
          Args:
              given_value: The given value's pixels will be value in 1,
              other pixels will be value in 0.
              rasterfilename: The initial rasterfilena,e.
  
          Returns:
              binary_raster: Raster after binarization.