undef

s1a-iw-grd-vh-20170103t100055-20170103t100120-014666-017db4-002_filter

s1a-iw-grd-vv-20170103t100055-20170103t100120-014666-017db4-001_filter

s1a-iw-grd-vh-20170103t100055-20170103t100120-014666-017db4-002_winddir

s1a-iw-grd-vv-20170103t100055-20170103t100120-014666-017db4-001_winddir