undef

s1b-iw-grd-vh-20180212t084913-20180212t084942-009588-011467-002_filter

s1b-iw-grd-vv-20180212t084913-20180212t084942-009588-011467-001_filter

s1b-iw-grd-vv-20180212t084913-20180212t084942-009588-011467-001_winddir

s1b-iw-grd-vh-20180212t084913-20180212t084942-009588-011467-002_winddir