class_docstr: AHI gridded format reader.
  
  This data is flat binary, big endian unsigned short.
  It covers the region 85E -> 205E, 60N -> 60S at variable resolution:
  - 0.005 degrees for Band 3
  - 0.01 degrees for Bands 1, 2 and 4
  - 0.02 degrees for all other bands.
  These are approximately equivalent to 0.5, 1 and 2km.
  
  Files can either be zipped with bz2 compression (like the HSD format
  data), or can be uncompressed flat binary.
docstr: Calibrate the data.
docstr_tok: ["Calibrate","the","data","."]
code: def calibrate(self, data, calib):
      """Calibrate the data."""
      if calib == "counts":
          return data
      if calib == "reflectance" or calib == "brightness_temperature":
          return self._calibrate(data)
      raise NotImplementedError(
          "ERROR: Unsupported calibration.",
          "Only counts, reflectance and ",
          "brightness_temperature calibration",
          "are supported.",
      )
  
imports: import logging
  import os
  import dask.array
  import numpy
  import xarray
  from appdirs import AppDirs
  from pyresample import geometry
  from satpy.readers.file_handlers import BaseFileHandler
  from satpy.readers.utils import unzip_file
  from satpy.utils import get_legacy_chunk_size
label_desc: Use image node_id 12 for calling the AHIGriddedFileHandler obj's underlying member method code with example usage: obj.calibrate(data, calib) and returns: data, self