docs: def is_valid(self):
          """
          Check image integrity.
          Tries to compute the checksum for each raster layer and returns False if this fails.
          See this forum entry:
          `How to check if image is valid? <https://lists.osgeo.org/pipermail/gdal-dev/2013-November/037520.html>`_.
  
          Returns
          -------
          bool
              is the file valid?
          """
          for i in range(self.raster.RasterCount):
              try:
                  checksum = self.raster.GetRasterBand(i + 1).Checksum()
              except RuntimeError:
                  return False
          return True