undef

s1b-ew-grd-hv-20170604t100108-20170604t100212-005899-00a589-002_filter

s1b-ew-grd-hh-20170604t100108-20170604t100212-005899-00a589-001_filter

s1b-ew-grd-hh-20170604t100108-20170604t100212-005899-00a589-001_winddir

s1b-ew-grd-hv-20170604t100108-20170604t100212-005899-00a589-002_winddir