undef

s1b-ew-grd-vh-20180907t023513-20180907t023613-012603-01740e-002_filter

s1b-ew-grd-vv-20180907t023513-20180907t023613-012603-01740e-001_filter

s1b-ew-grd-vh-20180907t023513-20180907t023613-012603-01740e-002_winddir

s1b-ew-grd-vv-20180907t023513-20180907t023613-012603-01740e-001_winddir