undef

s1a-ew-grd-vv-20160830t094412-20160830t094516-012828-0143c4-001_filter

s1a-ew-grd-vh-20160830t094412-20160830t094516-012828-0143c4-002_filter

s1a-ew-grd-vh-20160830t094412-20160830t094516-012828-0143c4-002_winddir

s1a-ew-grd-vv-20160830t094412-20160830t094516-012828-0143c4-001_winddir