code: def meta(self):
          
          # Use buffered data if available
          if self._meta is None:
              lat = self.geo_data['lat']
              earth_mask = self._get_earth_mask(lat)
              crow, ccol = self._get_nadir_pixel(earth_mask=earth_mask,
                                                 sector=self.sector)
              lat0 = lat.values[crow, ccol] if crow is not None else None
              yaw_flip = self._is_yaw_flip(lat)
              del lat
  
              lon = self.geo_data['lon']
              lon0 = lon.values[crow, ccol] if crow is not None else None
              area_def_uni = self._get_area_def_uniform_sampling(
                  lon0=lon0, channel=self.gvar_channel)
              del lon
  
              self._meta = {'earth_mask': earth_mask,
                            'yaw_flip': yaw_flip,
                            'lat0': lat0,
                            'lon0': lon0,
                            'nadir_row': crow,
                            'nadir_col': ccol,
                            'area_def_uni': area_def_uni}
          return self._meta
docs: Derive metadata from the coordinates