undef
s1a-iw-grd-vv-20150520t062133-20150520t062202-006001-007bc9-001_filter
s1a-iw-grd-vh-20150520t062133-20150520t062202-006001-007bc9-002_filter
s1a-iw-grd-vv-20150520t062133-20150520t062202-006001-007bc9-001_winddir
s1a-iw-grd-vh-20150520t062133-20150520t062202-006001-007bc9-002_winddir