undef

s1a-ew-grd-vh-20180908t040808-20180908t040908-023602-029243-002_filter

s1a-ew-grd-vv-20180908t040808-20180908t040908-023602-029243-001_filter

s1a-ew-grd-vv-20180908t040808-20180908t040908-023602-029243-001_winddir

s1a-ew-grd-vh-20180908t040808-20180908t040908-023602-029243-002_winddir