undef

s1a-iw-grd-vv-20160416t215217-20160416t215251-010852-0103db-001_filter

s1a-iw-grd-vh-20160416t215217-20160416t215251-010852-0103db-002_filter

s1a-iw-grd-vh-20160416t215217-20160416t215251-010852-0103db-002_winddir

s1a-iw-grd-vv-20160416t215217-20160416t215251-010852-0103db-001_winddir