undef

s1b-ew-grd-vv-20180907t041510-20180907t041610-012604-017415-001_filter

s1b-ew-grd-vh-20180907t041510-20180907t041610-012604-017415-002_filter

s1b-ew-grd-vv-20180907t041510-20180907t041610-012604-017415-001_winddir

s1b-ew-grd-vh-20180907t041510-20180907t041610-012604-017415-002_winddir