undef

s1b-iw-grd-vv-20170508t182211-20170508t182229-005510-009a7c-001_filter

s1b-iw-grd-vh-20170508t182211-20170508t182229-005510-009a7c-002_filter

s1b-iw-grd-vh-20170508t182211-20170508t182229-005510-009a7c-002_winddir

s1b-iw-grd-vv-20170508t182211-20170508t182229-005510-009a7c-001_winddir