undef

s1a-ew-grd-hh-20160607t142541-20160607t142635-011606-011bda-001_filter

s1a-ew-grd-hv-20160607t142541-20160607t142635-011606-011bda-002_filter

s1a-ew-grd-hh-20160607t142541-20160607t142635-011606-011bda-001_winddir

s1a-ew-grd-hv-20160607t142541-20160607t142635-011606-011bda-002_winddir