undef

s1b-iw-grd-vv-20170716t085738-20170716t085806-006511-00b730-001_filter

s1b-iw-grd-vh-20170716t085738-20170716t085806-006511-00b730-002_filter

s1b-iw-grd-vh-20170716t085738-20170716t085806-006511-00b730-002_winddir

s1b-iw-grd-vv-20170716t085738-20170716t085806-006511-00b730-001_winddir