undef

s1a-iw-grd-vv-20170127t100025-20170127t100054-015016-018875-001_filter

s1a-iw-grd-vh-20170127t100025-20170127t100054-015016-018875-002_filter

s1a-iw-grd-vv-20170127t100025-20170127t100054-015016-018875-001_winddir

s1a-iw-grd-vh-20170127t100025-20170127t100054-015016-018875-002_winddir