undef

s1a-ew-grd-vh-20180904t210708-20180904t210809-023554-0290b5-002_filter

s1a-ew-grd-vv-20180904t210708-20180904t210809-023554-0290b5-001_filter

s1a-ew-grd-vh-20180904t210708-20180904t210809-023554-0290b5-002_winddir

s1a-ew-grd-vv-20180904t210708-20180904t210809-023554-0290b5-001_winddir