undef

s1a-ew-grd-hv-20160602t123935-20160602t124003-011532-011995-002_filter

s1a-ew-grd-hh-20160602t123935-20160602t124003-011532-011995-001_filter

s1a-ew-grd-hv-20160602t123935-20160602t124003-011532-011995-002_winddir

s1a-ew-grd-hh-20160602t123935-20160602t124003-011532-011995-001_winddir