undef

s1a-ew-grd-hh-20150906t164433-20150906t164533-007597-00a84b-001_filter

s1a-ew-grd-hv-20150906t164433-20150906t164533-007597-00a84b-002_filter

s1a-ew-grd-hh-20150906t164433-20150906t164533-007597-00a84b-001_winddir

s1a-ew-grd-hv-20150906t164433-20150906t164533-007597-00a84b-002_winddir