undef
s1a-ew-grd-vh-20180904t210608-20180904t210708-023554-0290b5-002_filter
s1a-ew-grd-vv-20180904t210608-20180904t210708-023554-0290b5-001_filter
s1a-ew-grd-vv-20180904t210608-20180904t210708-023554-0290b5-001_winddir
s1a-ew-grd-vh-20180904t210608-20180904t210708-023554-0290b5-002_winddir