undef

s1b-ew-grd-hh-20170526t102740-20170526t102840-005768-00a1bd-001_filter

s1b-ew-grd-hv-20170526t102740-20170526t102840-005768-00a1bd-002_filter

s1b-ew-grd-hh-20170526t102740-20170526t102840-005768-00a1bd-001_winddir

s1b-ew-grd-hv-20170526t102740-20170526t102840-005768-00a1bd-002_winddir