undef

s1a-ew-grd-vv-20160830t094616-20160830t094716-012828-0143c4-001_filter

s1a-ew-grd-vh-20160830t094616-20160830t094716-012828-0143c4-002_filter

s1a-ew-grd-vv-20160830t094616-20160830t094716-012828-0143c4-001_winddir

s1a-ew-grd-vh-20160830t094616-20160830t094716-012828-0143c4-002_winddir