undef

s1b-iw-grd-vv-20180806t123415-20180806t123432-012142-0165c4-001_filter

s1b-iw-grd-vh-20180806t123415-20180806t123432-012142-0165c4-002_filter

s1b-iw-grd-vh-20180806t123415-20180806t123432-012142-0165c4-002_winddir

s1b-iw-grd-vv-20180806t123415-20180806t123432-012142-0165c4-001_winddir