undef

s1a-ew-grd-hv-20160628t171828-20160628t171852-011914-01258d-002_filter

s1a-ew-grd-hh-20160628t171828-20160628t171852-011914-01258d-001_filter

s1a-ew-grd-hv-20160628t171828-20160628t171852-011914-01258d-002_winddir

s1a-ew-grd-hh-20160628t171828-20160628t171852-011914-01258d-001_winddir