undef

s1b-iw-grd-vh-20180414t174936-20180414t175001-010483-0131b1-002_filter

s1b-iw-grd-vv-20180414t174936-20180414t175001-010483-0131b1-001_filter

s1b-iw-grd-vv-20180414t174936-20180414t175001-010483-0131b1-001_winddir

s1b-iw-grd-vh-20180414t174936-20180414t175001-010483-0131b1-002_winddir