code: def execute(mp):
      
      # Reading and writing data works like this:
      with mp.open("file1", resampling="bilinear") as raster_file:
          if raster_file.is_empty():
              return "empty"
              # This assures a transparent tile instead of a pink error tile
              # is returned when using mapchete serve.
          dem = raster_file.read()
      return dem
docs: Example process for testing.
  
      Inputs:
      -------
      file1
          raster file
  
      Parameters:
      -----------
  
      Output:
      -------
      np.ndarray