OBSFILTER,
    DATA       = aircraft.bufr,
    OUTPUT     = GEOPOINTS,
    PARAMETER  = 012001,
    LEVEL      = DESCRIPTOR_RANGE,
    LEVEL_DESCRIPTOR = 007002,
    FIRST_LEVEL = 10000,
    SECOND_LEVEL = 20000,
    TIME       = 1400,
    RESOLUTION_IN_MINS = 30

