undef

s1b-ew-grd-hh-20170618t080647-20170618t080751-006102-00ab7a-001_filter

s1b-ew-grd-hv-20170618t080647-20170618t080751-006102-00ab7a-002_filter

s1b-ew-grd-hh-20170618t080647-20170618t080751-006102-00ab7a-001_winddir

s1b-ew-grd-hv-20170618t080647-20170618t080751-006102-00ab7a-002_winddir