undef

s1b-ew-grd-hh-20170809t091233-20170809t091338-006861-00c13d-001_filter

s1b-ew-grd-hv-20170809t091233-20170809t091338-006861-00c13d-002_filter

s1b-ew-grd-hv-20170809t091233-20170809t091338-006861-00c13d-002_winddir

s1b-ew-grd-hh-20170809t091233-20170809t091338-006861-00c13d-001_winddir