undef

s1a-ew-grd-hh-20160702t164426-20160702t164526-011972-012764-001_filter

s1a-ew-grd-hv-20160702t164426-20160702t164526-011972-012764-002_filter

s1a-ew-grd-hh-20160702t164426-20160702t164526-011972-012764-001_winddir

s1a-ew-grd-hv-20160702t164426-20160702t164526-011972-012764-002_winddir