OBSFILTER,
    DATA       = synop.bufr,
    OUTPUT     = GEOPOINTS,
    LEVEL      = DESCRIPTOR_RANGE,
    LEVEL_DESCRIPTOR = 007001,
    FIRST_LEVEL = 500,
    SECOND_LEVEL = 5000,
    LOCATION_FILTER = AREA,
    AREA       = 44/4/50/16

