undef

s1b-iw-grd-vh-20180217t085709-20180217t085738-009661-0116cd-002_filter

s1b-iw-grd-vv-20180217t085709-20180217t085738-009661-0116cd-001_filter

s1b-iw-grd-vv-20180217t085709-20180217t085738-009661-0116cd-001_winddir

s1b-iw-grd-vh-20180217t085709-20180217t085738-009661-0116cd-002_winddir