undef

s1b-ew-grd-hh-20171209t153330-20171209t153420-008644-00f5af-001_filter

s1b-ew-grd-hv-20171209t153330-20171209t153420-008644-00f5af-002_filter

s1b-ew-grd-hh-20171209t153330-20171209t153420-008644-00f5af-001_winddir

s1b-ew-grd-hv-20171209t153330-20171209t153420-008644-00f5af-002_winddir