undef
s1b-ew-grd-vv-20170206t081616-20170206t081716-004177-0073b6-001_filter
s1b-ew-grd-vh-20170206t081616-20170206t081716-004177-0073b6-002_filter
s1b-ew-grd-vv-20170206t081616-20170206t081716-004177-0073b6-001_winddir
s1b-ew-grd-vh-20170206t081616-20170206t081716-004177-0073b6-002_winddir