undef

s1b-ew-grd-hv-20170622t140851-20170622t140956-006164-00ad42-002_filter

s1b-ew-grd-hh-20170622t140851-20170622t140956-006164-00ad42-001_filter

s1b-ew-grd-hh-20170622t140851-20170622t140956-006164-00ad42-001_winddir

s1b-ew-grd-hv-20170622t140851-20170622t140956-006164-00ad42-002_winddir