undef

s1b-ew-grd-hv-20170617t140040-20170617t140144-006091-00ab22-002_filter

s1b-ew-grd-hh-20170617t140040-20170617t140144-006091-00ab22-001_filter

s1b-ew-grd-hh-20170617t140040-20170617t140144-006091-00ab22-001_winddir

s1b-ew-grd-hv-20170617t140040-20170617t140144-006091-00ab22-002_winddir