undef

s1a-ew-grd-vv-20180904t210504-20180904t210608-023554-0290b5-001_filter

s1a-ew-grd-vh-20180904t210504-20180904t210608-023554-0290b5-002_filter

s1a-ew-grd-vv-20180904t210504-20180904t210608-023554-0290b5-001_winddir

s1a-ew-grd-vh-20180904t210504-20180904t210608-023554-0290b5-002_winddir