undef

s1a-iw-grd-vh-20180221t062202-20180221t062227-020701-023765-002_filter

s1a-iw-grd-vv-20180221t062202-20180221t062227-020701-023765-001_filter

s1a-iw-grd-vv-20180221t062202-20180221t062227-020701-023765-001_winddir

s1a-iw-grd-vh-20180221t062202-20180221t062227-020701-023765-002_winddir