undef

s1b-iw-grd-vv-20170923t104554-20170923t104619-007518-00d45f-001_filter

s1b-iw-grd-vh-20170923t104554-20170923t104619-007518-00d45f-002_filter

s1b-iw-grd-vv-20170923t104554-20170923t104619-007518-00d45f-001_winddir

s1b-iw-grd-vh-20170923t104554-20170923t104619-007518-00d45f-002_winddir