undef

s1a-iw-grd-vv-20180611t205944-20180611t210009-022314-026a4d-001_filter

s1a-iw-grd-vh-20180611t205944-20180611t210009-022314-026a4d-002_filter

s1a-iw-grd-vv-20180611t205944-20180611t210009-022314-026a4d-001_winddir

s1a-iw-grd-vh-20180611t205944-20180611t210009-022314-026a4d-002_winddir