undef

s1a-iw-grd-vh-20170307t205110-20170307t205135-015591-019a1e-002_filter

s1a-iw-grd-vv-20170307t205110-20170307t205135-015591-019a1e-001_filter

s1a-iw-grd-vv-20170307t205110-20170307t205135-015591-019a1e-001_winddir

s1a-iw-grd-vh-20170307t205110-20170307t205135-015591-019a1e-002_winddir