undef

s1a-ew-grd-vv-20160923t222232-20160923t222332-013186-014f7c-001_filter

s1a-ew-grd-vh-20160923t222232-20160923t222332-013186-014f7c-002_filter

s1a-ew-grd-vv-20160923t222232-20160923t222332-013186-014f7c-001_winddir

s1a-ew-grd-vh-20160923t222232-20160923t222332-013186-014f7c-002_winddir