undef

s1a-ew-grd-hh-20150923t151426-20150923t151526-007844-00aee6-001_filter

s1a-ew-grd-hv-20150923t151426-20150923t151526-007844-00aee6-002_filter

s1a-ew-grd-hv-20150923t151426-20150923t151526-007844-00aee6-002_winddir

s1a-ew-grd-hh-20150923t151426-20150923t151526-007844-00aee6-001_winddir