undef

s1a-iw-grd-vh-20170517t215227-20170517t215301-016627-01b967-002_filter

s1a-iw-grd-vv-20170517t215227-20170517t215301-016627-01b967-001_filter

s1a-iw-grd-vv-20170517t215227-20170517t215301-016627-01b967-001_winddir

s1a-iw-grd-vh-20170517t215227-20170517t215301-016627-01b967-002_winddir