undef

s1b-ew-grd-hh-20170810t113216-20170810t113316-006877-00c1b0-001_filter

s1b-ew-grd-hv-20170810t113216-20170810t113316-006877-00c1b0-002_filter

s1b-ew-grd-hv-20170810t113216-20170810t113316-006877-00c1b0-002_winddir

s1b-ew-grd-hh-20170810t113216-20170810t113316-006877-00c1b0-001_winddir