undef

s1b-iw-grd-vh-20170926t085741-20170926t085809-007561-00d594-002_filter

s1b-iw-grd-vv-20170926t085741-20170926t085809-007561-00d594-001_filter

s1b-iw-grd-vh-20170926t085741-20170926t085809-007561-00d594-002_winddir

s1b-iw-grd-vv-20170926t085741-20170926t085809-007561-00d594-001_winddir