undef

s1b-ew-grd-hv-20170713t170023-20170713t170127-006472-00b614-002_filter

s1b-ew-grd-hh-20170713t170023-20170713t170127-006472-00b614-001_filter

s1b-ew-grd-hh-20170713t170023-20170713t170127-006472-00b614-001_winddir

s1b-ew-grd-hv-20170713t170023-20170713t170127-006472-00b614-002_winddir