undef
s1a-ew-grd-vv-20160923t222332-20160923t222431-013186-014f7c-001_filter
s1a-ew-grd-vh-20160923t222332-20160923t222431-013186-014f7c-002_filter
s1a-ew-grd-vv-20160923t222332-20160923t222431-013186-014f7c-001_winddir
s1a-ew-grd-vh-20160923t222332-20160923t222431-013186-014f7c-002_winddir