undef
s1a-ew-grd-vv-20180117t143701-20180117t143801-020195-022745-001_filter
s1a-ew-grd-vh-20180117t143701-20180117t143801-020195-022745-002_filter
s1a-ew-grd-vv-20180117t143701-20180117t143801-020195-022745-001_winddir
s1a-ew-grd-vh-20180117t143701-20180117t143801-020195-022745-002_winddir