class_docstr: Writer to produce MITIFF image files.
code: def _add_proj4_string(self, datasets, first_dataset, **kwargs):
      import warnings
  
      proj4_string = " Proj string: "
  
      if isinstance(datasets, list):
          area = first_dataset.attrs["area"]
      else:
          area = datasets.attrs["area"]
      # Use pyproj's CRS object to get a valid EPSG code if possible
      # only in newer pyresample versions with pyproj 2.0+ installed
      if hasattr(area, "crs") and area.crs.to_epsg() is not None:
          proj4_string += "+init=EPSG:{}".format(area.crs.to_epsg())
      else:
          # Filter out the PROJ warning of losing projection information
          with warnings.catch_warnings():
              warnings.filterwarnings(
                  "ignore",
                  category=UserWarning,
                  message=r"You will likely lose important projection information",
              )
              proj4_string += area.proj_str
  
      x_0 = 0
      y_0 = 0
      # FUTURE: Use pyproj 2.0+ to convert EPSG to PROJ4 if possible
      proj4_string, x_0 = self._convert_epsg_to_proj(proj4_string, x_0)
  
      proj4_string = self._special_correction_of_proj_string(
          proj4_string
      )
  
      if isinstance(datasets, list):
          _dataset = first_dataset
      else:
          _dataset = datasets
      mitiff_pixel_adjustment = kwargs.get(
          "mitiff_pixel_adjustment", True
      )
      proj4_string = self._append_projection_center(
          proj4_string, _dataset, x_0, y_0, mitiff_pixel_adjustment
      )
      LOG.debug("proj4_string: %s", proj4_string)
      proj4_string += "\n"
  
      return proj4_string
  
imports: import logging
  import os
  import dask
  import numpy
  from PIL import Image, ImagePalette
  from satpy.dataset import DataID, DataQuery
  from satpy.writers import ImageWriter, get_enhanced_image
label_desc: Use image node_id 9 for calling the MITIFFWriter obj's underlying member method code with example usage: obj._add_proj4_string(datasets, first_dataset) and returns: proj4_string