undef

s1a-ew-grd-hv-20150907t172525-20150907t172625-007612-00a8b4-002_filter

s1a-ew-grd-hh-20150907t172525-20150907t172625-007612-00a8b4-001_filter

s1a-ew-grd-hh-20150907t172525-20150907t172625-007612-00a8b4-001_winddir

s1a-ew-grd-hv-20150907t172525-20150907t172625-007612-00a8b4-002_winddir