undef
s1a-iw-grd-vv-20190504t000332-20190504t000357-027070-030cb5-001_filter
s1a-iw-grd-vh-20190504t000332-20190504t000357-027070-030cb5-002_filter
s1a-iw-grd-vv-20190504t000332-20190504t000357-027070-030cb5-001_winddir
s1a-iw-grd-vh-20190504t000332-20190504t000357-027070-030cb5-002_winddir