undef

s1a-iw-grd-vv-20170807t100058-20170807t100123-017816-01ddcb-001_filter

s1a-iw-grd-vh-20170807t100058-20170807t100123-017816-01ddcb-002_filter

s1a-iw-grd-vh-20170807t100058-20170807t100123-017816-01ddcb-002_winddir

s1a-iw-grd-vv-20170807t100058-20170807t100123-017816-01ddcb-001_winddir