undef

s1b-iw-grd-vv-20180515t062921-20180515t062946-010928-014000-001_filter

s1b-iw-grd-vh-20180515t062921-20180515t062946-010928-014000-002_filter

s1b-iw-grd-vv-20180515t062921-20180515t062946-010928-014000-001_winddir

s1b-iw-grd-vh-20180515t062921-20180515t062946-010928-014000-002_winddir