undef

s1b-ew-grd-hv-20170617t104408-20170617t104507-006089-00ab19-002_filter

s1b-ew-grd-hh-20170617t104408-20170617t104507-006089-00ab19-001_filter

s1b-ew-grd-hv-20170617t104408-20170617t104507-006089-00ab19-002_winddir

s1b-ew-grd-hh-20170617t104408-20170617t104507-006089-00ab19-001_winddir