undef

s1b-iw-grd-vh-20180913t231322-20180913t231347-012703-01771e-002_filter

s1b-iw-grd-vv-20180913t231322-20180913t231347-012703-01771e-001_filter

s1b-iw-grd-vv-20180913t231322-20180913t231347-012703-01771e-001_winddir

s1b-iw-grd-vh-20180913t231322-20180913t231347-012703-01771e-002_winddir