docs: def numpy2gdalint(self):
          """
          create a dictionary for mapping numpy data types to GDAL data type codes
  
          Returns
          -------
          dict
              the type map
          """
          if not hasattr(self, '__numpy2gdalint'):
              tmap = {}
              
              for group in ['int', 'uint', 'float', 'complex']:
                  for dtype in np.sctypes[group]:
                      code = gdal_array.NumericTypeCodeToGDALTypeCode(dtype)
                      if code is not None:
                          tmap[dtype().dtype.name] = code
              self.__numpy2gdalint = tmap
          return self.__numpy2gdalint