undef

s1a-ew-grd-vh-20180908t093806-20180908t093910-023605-029263-002_filter

s1a-ew-grd-vv-20180908t093806-20180908t093910-023605-029263-001_filter

s1a-ew-grd-vv-20180908t093806-20180908t093910-023605-029263-001_winddir

s1a-ew-grd-vh-20180908t093806-20180908t093910-023605-029263-002_winddir