undef

s1a-ew-grd-hv-20150929t124658-20150929t124758-007930-00b13f-002_filter

s1a-ew-grd-hh-20150929t124658-20150929t124758-007930-00b13f-001_filter

s1a-ew-grd-hh-20150929t124658-20150929t124758-007930-00b13f-001_winddir

s1a-ew-grd-hv-20150929t124658-20150929t124758-007930-00b13f-002_winddir