undef
s1a-ew-grd-vh-20180818t150404-20180818t150504-023302-0288c3-002_filter
s1a-ew-grd-vv-20180818t150404-20180818t150504-023302-0288c3-001_filter
s1a-ew-grd-vv-20180818t150404-20180818t150504-023302-0288c3-001_winddir
s1a-ew-grd-vh-20180818t150404-20180818t150504-023302-0288c3-002_winddir