undef

s1b-ew-grd-hh-20170710t100215-20170710t100315-006424-00b4b2-001_filter

s1b-ew-grd-hv-20170710t100215-20170710t100315-006424-00b4b2-002_filter

s1b-ew-grd-hv-20170710t100215-20170710t100315-006424-00b4b2-002_winddir

s1b-ew-grd-hh-20170710t100215-20170710t100315-006424-00b4b2-001_winddir