undef

s1b-ew-grd-hv-20170715t150549-20170715t150653-006500-00b6e0-002_filter

s1b-ew-grd-hh-20170715t150549-20170715t150653-006500-00b6e0-001_filter

s1b-ew-grd-hv-20170715t150549-20170715t150653-006500-00b6e0-002_winddir

s1b-ew-grd-hh-20170715t150549-20170715t150653-006500-00b6e0-001_winddir