class_docstr: SEVIRI calibration algorithms.
class_docstr_tok: ["SEVIRI","calibration","algorithms","."]
docstr: Calibrate to reflectance.
  
  This uses the method described in Conversion from radiances to
  reflectances for SEVIRI warm channels: https://www-cdn.eumetsat.int/files/2020-04/pdf_msg_seviri_rad2refl.pdf
docstr_tok: ["Calibrate","to","reflectance",".","This","uses","the","method","described","in","Conversion","from","radiances","to","reflectances","for","SEVIRI","warm","channels",":","https",":","\/\/www-cdn.eumetsat.int\/files\/2020-04\/pdf_msg_seviri_rad2refl.pdf"]
code: def vis_calibrate(self, data, solar_irradiance):
      """Calibrate to reflectance.
  
      This uses the method described in Conversion from radiances to
      reflectances for SEVIRI warm channels: https://www-cdn.eumetsat.int/files/2020-04/pdf_msg_seviri_rad2refl.pdf
      """
      reflectance = np.pi * data * 100.0 / solar_irradiance
      return apply_earthsun_distance_correction(
          reflectance, self._scan_time
      )
  
imports: from __future__ import annotations
  import warnings
  from datetime import datetime, timedelta
  import dask.array
  import numpy
  import pyproj
  from numpy.polynomial.chebyshev import Chebyshev
  from satpy.readers.eum_base import issue_revision, time_cds_short
  from satpy.readers.utils import apply_earthsun_distance_correction
  from satpy.utils import get_legacy_chunk_size
label_desc: Use image node_id 7 for calling the SEVIRICalibrationAlgorithm obj's underlying member method code with example usage: obj.vis_calibrate(data, solar_irradiance) and returns: apply_earthsun_distance_correction