class_docstr: SEVIRI HRIT format reader.
  
  **Calibration**
  
  See :mod:`satpy.readers.seviri_base`.
  
  
  **Padding of the HRV channel**
  
  By default, the HRV channel is loaded padded with no-data, returning
  a full-disk dataset. If you want the original, unpadded data,
  just provide the `fill_hrv` as False in the `reader_kwargs`::
  
      scene = satpy.Scene(filenames,
                          reader='seviri_l1b_hrit',
                          reader_kwargs={'fill_hrv': False})
  
  **Metadata**
  
  See :mod:`satpy.readers.seviri_base`.
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docstr: Read the header info, and fill the metadata dictionary.
code: def _get_header(self):
      """Read the header info, and fill the metadata dictionary."""
      earth_model = self.prologue["GeometricProcessing"]["EarthModel"]
      self.mda["offset_corrected"] = (
          earth_model["TypeOfEarthModel"] == 2
      )
  
      # Projection
      a, b = self.prologue_.get_earth_radii()
      self.mda["projection_parameters"]["a"] = a
      self.mda["projection_parameters"]["b"] = b
      ssp = self.prologue["ImageDescription"]["ProjectionDescription"][
          "LongitudeOfSSP"
      ]
      self.mda["projection_parameters"]["SSP_longitude"] = ssp
      self.mda["projection_parameters"]["SSP_latitude"] = 0.0
  
      # Orbital parameters
      self.mda["orbital_parameters"][
          "satellite_nominal_longitude"
      ] = self.prologue["SatelliteStatus"]["SatelliteDefinition"][
          "NominalLongitude"
      ]
      self.mda["orbital_parameters"]["satellite_nominal_latitude"] = 0.0
      try:
          actual_lon, actual_lat, actual_alt = self.prologue_.satpos
          self.mda["orbital_parameters"][
              "satellite_actual_longitude"
          ] = actual_lon
          self.mda["orbital_parameters"][
              "satellite_actual_latitude"
          ] = actual_lat
          self.mda["orbital_parameters"][
              "satellite_actual_altitude"
          ] = actual_alt
      except NoValidOrbitParams as err:
          logger.warning(err)
  
      # Misc
      self.platform_id = self.prologue["SatelliteStatus"][
          "SatelliteDefinition"
      ]["SatelliteId"]
      self.platform_name = "Meteosat-" + SATNUM[self.platform_id]
      self.mda["platform_name"] = self.platform_name
      service = self._filename_info["service"]
      if service == "":
          self.mda["service"] = "0DEG"
      else:
          self.mda["service"] = service
      self.channel_name = CHANNEL_NAMES[self.mda["spectral_channel_id"]]
  
imports: from __future__ import division
  import copy
  import logging
  from datetime import timedelta
  import dask.array
  import numpy
  import xarray
  from pyresample import geometry
  import satpy.readers.utils
  from satpy._compat import cached_property
  from satpy.readers._geos_area import get_area_definition, get_area_extent, get_geos_area_naming
  from satpy.readers.eum_base import get_service_mode, recarray2dict, time_cds_short
  from satpy.readers.hrit_base import HRITFileHandler, ancillary_text, annotation_header, base_hdr_map, image_data_function
  from satpy.readers.seviri_base import CHANNEL_NAMES, HRV_NUM_COLUMNS, REPEAT_CYCLE_DURATION, SATNUM, NoValidOrbitParams, OrbitPolynomialFinder, SEVIRICalibrationHandler, add_scanline_acq_time, create_coef_dict, get_cds_time, get_satpos, mask_bad_quality, pad_data_horizontally, round_nom_time
  from satpy.readers.seviri_l1b_native_hdr import hrit_epilogue, hrit_prologue, impf_configuration
  from satpy.utils import get_legacy_chunk_size
label_desc: Use image node_id 2 for calling the HRITMSGFileHandler obj's underlying member method code with example usage: obj._get_header() without return types