docs: def raster_to_asc(raster_f, asc_f):
          """Converting Raster format to ASCII raster.
  
          Args:
              raster_f: raster file.
              asc_f: output ASCII file.
          """
          raster_r = RasterUtilClass.read_raster(raster_f)
          RasterUtilClass.write_asc_file(asc_f, raster_r.data, raster_r.nCols, raster_r.nRows,
                                         raster_r.geotrans, raster_r.noDataValue)