class_docstr: File handler for NC seviri files.
  
  **Calibration**
  
  See :mod:`satpy.readers.seviri_base`. Note that there is only one set of
  calibration coefficients available in the netCDF files and therefore there
  is no `calib_mode` argument.
  
  **Metadata**
  
  See :mod:`satpy.readers.seviri_base`.
docstr: Calibrate the data.
code: def calibrate(self, dataset, dataset_id):
      """Calibrate the data."""
      channel = dataset_id["name"]
      calibration = dataset_id["calibration"]
  
      if dataset_id["calibration"] == "counts":
          dataset.attrs["_FillValue"] = 0
  
      calib = SEVIRICalibrationHandler(
          platform_id=int(self.platform_id),
          channel_name=channel,
          coefs=self._get_calib_coefs(dataset, channel),
          calib_mode="NOMINAL",
          scan_time=self.observation_start_time,
      )
  
      return calib.calibrate(dataset, calibration)
  
imports: import datetime
  import logging
  from datetime import timedelta
  import numpy
  from satpy._compat import cached_property
  from satpy.readers._geos_area import get_area_definition, get_geos_area_naming
  from satpy.readers.eum_base import get_service_mode
  from satpy.readers.file_handlers import BaseFileHandler, open_dataset
  from satpy.readers.seviri_base import CHANNEL_NAMES, SATNUM, NoValidOrbitParams, OrbitPolynomialFinder, SEVIRICalibrationHandler, add_scanline_acq_time, get_cds_time, get_satpos, mask_bad_quality, round_nom_time
  from satpy.utils import get_legacy_chunk_size
label_desc: Use image node_id 12 for calling the NCSEVIRIFileHandler obj's underlying member method code with example usage: obj.calibrate(dataset, dataset_id) and returns: calib