undef
s1b-ew-grd-vh-20180820t153604-20180820t153704-012348-016c38-002_filter
s1b-ew-grd-vv-20180820t153604-20180820t153704-012348-016c38-001_filter
s1b-ew-grd-vv-20180820t153604-20180820t153704-012348-016c38-001_winddir
s1b-ew-grd-vh-20180820t153604-20180820t153704-012348-016c38-002_winddir