undef

s1a-ew-grd-hv-20150709t140909-20150709t141009-006735-00905c-002_filter

s1a-ew-grd-hh-20150709t140909-20150709t141009-006735-00905c-001_filter

s1a-ew-grd-hv-20150709t140909-20150709t141009-006735-00905c-002_winddir

s1a-ew-grd-hh-20150709t140909-20150709t141009-006735-00905c-001_winddir