code: def encoding():
      """Dataset encoding."""
      return {
          "ctt": {"scale_factor": np.float32(0.01)},
      }
  
imports: import datetime
  import os
  import numpy
  import pytest
  import xarray
  from pyresample.geometry import AreaDefinition
  from satpy.tests.utils import make_dataid
label_desc: Use image node_id 4 for calling a global function with example usage: encoding() and returns: dict