undef

s1b-iw-grd-vv-20180307t215119-20180307t215148-009931-011fcd-001_filter

s1b-iw-grd-vh-20180307t215119-20180307t215148-009931-011fcd-002_filter

s1b-iw-grd-vv-20180307t215119-20180307t215148-009931-011fcd-001_winddir

s1b-iw-grd-vh-20180307t215119-20180307t215148-009931-011fcd-002_winddir