class_docstr: File handler for flags.
docstr: Initialize the flag reader.
docstr_tok: ["Initialize","the","flag","reader","."]
code: def __init__(self, filename, filename_info, filetype_info):
      """Initialize the flag reader."""
      super(NCSLSTRFlag, self).__init__(
          filename, filename_info, filetype_info
      )
      self.nc = xr.open_dataset(
          self.filename,
          decode_cf=True,
          mask_and_scale=True,
          chunks={"columns": CHUNK_SIZE, "rows": CHUNK_SIZE},
      )
      self.nc = self.nc.rename({"columns": "x", "rows": "y"})
      self.stripe = filename_info["stripe"]
      views = {"n": "nadir", "o": "oblique"}
      self.view = views[filename_info["view"]]
      # TODO: get metadata from the manifest file (xfdumanifest.xml)
      self.platform_name = PLATFORM_NAMES[filename_info["mission_id"]]
      self.sensor = "slstr"
  
imports: import logging
  import os
  import re
  import warnings
  from datetime import datetime
  import dask.array
  import numpy
  import xarray
  from satpy.readers.file_handlers import BaseFileHandler
  from satpy.utils import get_legacy_chunk_size
label_desc: Use image node_id 1 to create a new NCSLSTRFlag object from inherited base classes: BaseFileHandler with example: obj = NCSLSTRFlag(filename, filename_info, filetype_info)