undef
s1b-ew-grd-hh-20170604t100212-20170604t100312-005899-00a589-001_filter
s1b-ew-grd-hv-20170604t100212-20170604t100312-005899-00a589-002_filter
s1b-ew-grd-hh-20170604t100212-20170604t100312-005899-00a589-001_winddir
s1b-ew-grd-hv-20170604t100212-20170604t100312-005899-00a589-002_winddir