undef

s1a-iw-grd-vv-20170611t205139-20170611t205205-016991-01c4a7-001_filter

s1a-iw-grd-vh-20170611t205139-20170611t205205-016991-01c4a7-002_filter

s1a-iw-grd-vv-20170611t205139-20170611t205205-016991-01c4a7-001_winddir

s1a-iw-grd-vh-20170611t205139-20170611t205205-016991-01c4a7-002_winddir