undef

s1a-ew-grd-hh-20160701t142442-20160701t142542-011956-0126e9-001_filter

s1a-ew-grd-hv-20160701t142442-20160701t142542-011956-0126e9-002_filter

s1a-ew-grd-hh-20160701t142442-20160701t142542-011956-0126e9-001_winddir

s1a-ew-grd-hv-20160701t142442-20160701t142542-011956-0126e9-002_winddir