undef
s1b-ew-grd-hh-20170713t102743-20170713t102843-006468-00b5f5-001_filter
s1b-ew-grd-hv-20170713t102743-20170713t102843-006468-00b5f5-002_filter
s1b-ew-grd-hh-20170713t102743-20170713t102843-006468-00b5f5-001_winddir
s1b-ew-grd-hv-20170713t102743-20170713t102843-006468-00b5f5-002_winddir