undef

s1a-ew-grd-hv-20150721t172523-20150721t172623-006912-00957d-002_filter

s1a-ew-grd-hh-20150721t172523-20150721t172623-006912-00957d-001_filter

s1a-ew-grd-hv-20150721t172523-20150721t172623-006912-00957d-002_winddir

s1a-ew-grd-hh-20150721t172523-20150721t172623-006912-00957d-001_winddir