undef

s1b-iw-grd-vh-20180518t215145-20180518t215203-010981-0141b8-002_filter

s1b-iw-grd-vv-20180518t215145-20180518t215203-010981-0141b8-001_filter

s1b-iw-grd-vh-20180518t215145-20180518t215203-010981-0141b8-002_winddir

s1b-iw-grd-vv-20180518t215145-20180518t215203-010981-0141b8-001_winddir