undef

s1b-ew-grd-vv-20170206t081516-20170206t081616-004177-0073b6-001_filter

s1b-ew-grd-vh-20170206t081516-20170206t081616-004177-0073b6-002_filter

s1b-ew-grd-vh-20170206t081516-20170206t081616-004177-0073b6-002_winddir

s1b-ew-grd-vv-20170206t081516-20170206t081616-004177-0073b6-001_winddir