undef

s1b-ew-grd-hh-20170711t072557-20170711t072701-006437-00b50f-001_filter

s1b-ew-grd-hv-20170711t072557-20170711t072701-006437-00b50f-002_filter

s1b-ew-grd-hv-20170711t072557-20170711t072701-006437-00b50f-002_winddir

s1b-ew-grd-hh-20170711t072557-20170711t072701-006437-00b50f-001_winddir