undef

s1a-ew-grd-vh-20180908t161305-20180908t161409-023609-029283-002_filter

s1a-ew-grd-vv-20180908t161305-20180908t161409-023609-029283-001_filter

s1a-ew-grd-vv-20180908t161305-20180908t161409-023609-029283-001_winddir

s1a-ew-grd-vh-20180908t161305-20180908t161409-023609-029283-002_winddir