code: def geos2cf(area):
      
      proj_dict = area.proj_dict
      args = dict(perspective_point_height=proj_dict.get('h'),
                  latitude_of_projection_origin=proj_dict.get('lat_0'),
                  longitude_of_projection_origin=proj_dict.get('lon_0'),
                  grid_mapping_name='geostationary',
                  semi_major_axis=proj_dict.get('a'),
                  semi_minor_axis=proj_dict.get('b'),
                  sweep_axis=proj_dict.get('sweep'),
                  )
      return args
docs: Return the cf grid mapping for the geos projection.