undef

s1b-iw-grd-vv-20170704t085708-20170704t085737-006336-00b237-001_filter

s1b-iw-grd-vh-20170704t085708-20170704t085737-006336-00b237-002_filter

s1b-iw-grd-vh-20170704t085708-20170704t085737-006336-00b237-002_winddir

s1b-iw-grd-vv-20170704t085708-20170704t085737-006336-00b237-001_winddir