def eeCollection(mission):
  """
  Earth Engine image collection name from satellite mission name
  """

  switch = {
    'Sentinel2':'COPERNICUS/S2',
    'Landsat8':'LANDSAT/LC08/C01/T1_TOA',
    'Landsat7':'LANDSAT/LE05/C01/T1_TOA',
    'Landsat5':'LANDSAT/LT05/C01/T1_TOA',
    'Landsat4':'LANDSAT/LT04/C01/T1_TOA'
  }

  return switch[mission]