undef

s1b-ew-grd-hh-20170713t102643-20170713t102743-006468-00b5f5-001_filter

s1b-ew-grd-hv-20170713t102643-20170713t102743-006468-00b5f5-002_filter

s1b-ew-grd-hh-20170713t102643-20170713t102743-006468-00b5f5-001_winddir

s1b-ew-grd-hv-20170713t102643-20170713t102743-006468-00b5f5-002_winddir