undef

s1b-iw-grd-vv-20171113t085741-20171113t085810-008261-00e9ca-001_filter

s1b-iw-grd-vh-20171113t085741-20171113t085810-008261-00e9ca-002_filter

s1b-iw-grd-vh-20171113t085741-20171113t085810-008261-00e9ca-002_winddir

s1b-iw-grd-vv-20171113t085741-20171113t085810-008261-00e9ca-001_winddir