undef

s1a-iw-grd-vh-20170309t100930-20170309t100955-015614-019aca-002_filter

s1a-iw-grd-vv-20170309t100930-20170309t100955-015614-019aca-001_filter

s1a-iw-grd-vh-20170309t100930-20170309t100955-015614-019aca-002_winddir

s1a-iw-grd-vv-20170309t100930-20170309t100955-015614-019aca-001_winddir