undef

s1b-iw-grd-vv-20180220t062919-20180220t062944-009703-011820-001_filter

s1b-iw-grd-vh-20180220t062919-20180220t062944-009703-011820-002_filter

s1b-iw-grd-vh-20180220t062919-20180220t062944-009703-011820-002_winddir

s1b-iw-grd-vv-20180220t062919-20180220t062944-009703-011820-001_winddir