code: def read(self, output_tile, **kwargs):
          
          try:
              return read_raster_no_crs(self.get_path(output_tile))
          except FileNotFoundError:
              return self.empty(output_tile)
docs: Read existing process output.
  
          Parameters
          ----------
          output_tile : ``BufferedTile``
              must be member of output ``TilePyramid``
  
          Returns
          -------
          NumPy array