undef
s1a-iw-grd-vh-20190520t205056-20190520t205125-027316-0314ae-002_filter
s1a-iw-grd-vv-20190520t205056-20190520t205125-027316-0314ae-001_filter
s1a-iw-grd-vv-20190520t205056-20190520t205125-027316-0314ae-001_winddir
s1a-iw-grd-vh-20190520t205056-20190520t205125-027316-0314ae-002_winddir