undef

s1a-ew-grd-hv-20160203t155904-20160203t160008-009784-00e4ee-002_filter

s1a-ew-grd-hh-20160203t155904-20160203t160008-009784-00e4ee-001_filter

s1a-ew-grd-hh-20160203t155904-20160203t160008-009784-00e4ee-001_winddir

s1a-ew-grd-hv-20160203t155904-20160203t160008-009784-00e4ee-002_winddir