undef

s1a-iw-grd-vv-20180111t212220-20180111t212249-020112-0224b0-001_filter

s1a-iw-grd-vh-20180111t212220-20180111t212249-020112-0224b0-002_filter

s1a-iw-grd-vh-20180111t212220-20180111t212249-020112-0224b0-002_winddir

s1a-iw-grd-vv-20180111t212220-20180111t212249-020112-0224b0-001_winddir