undef

s1b-ew-grd-hh-20181204t153437-20181204t153537-013894-019c41-001_filter

s1b-ew-grd-hv-20181204t153437-20181204t153537-013894-019c41-002_filter

s1b-ew-grd-hh-20181204t153437-20181204t153537-013894-019c41-001_winddir

s1b-ew-grd-hv-20181204t153437-20181204t153537-013894-019c41-002_winddir