def py6S_sensor(mission):
  """
  Py6S satellite_sensor name from satellite mission name
  """
  
  switch = {
    'Sentinel2':'S2A_MSI',
    'Landsat8':'LANDSAT_OLI',
    'Landsat7':'LANDSAT_ETM',
    'Landsat5':'LANDSAT_TM',
    'Landsat4':'LANDSAT_TM'
  }

  return switch[mission]