undef

s1b-ew-grd-hh-20170721t110029-20170721t110129-006585-00b94d-001_filter

s1b-ew-grd-hv-20170721t110029-20170721t110129-006585-00b94d-002_filter

s1b-ew-grd-hv-20170721t110029-20170721t110129-006585-00b94d-002_winddir

s1b-ew-grd-hh-20170721t110029-20170721t110129-006585-00b94d-001_winddir