undef
s1b-ew-grd-vh-20180907t041406-20180907t041510-012604-017415-002_filter
s1b-ew-grd-vv-20180907t041406-20180907t041510-012604-017415-001_filter
s1b-ew-grd-vv-20180907t041406-20180907t041510-012604-017415-001_winddir
s1b-ew-grd-vh-20180907t041406-20180907t041510-012604-017415-002_winddir