undef

s1a-ew-grd-hv-20150716t171725-20150716t171825-006839-00936f-002_filter

s1a-ew-grd-hh-20150716t171725-20150716t171825-006839-00936f-001_filter

s1a-ew-grd-hh-20150716t171725-20150716t171825-006839-00936f-001_winddir

s1a-ew-grd-hv-20150716t171725-20150716t171825-006839-00936f-002_winddir