undef

s1b-iw-grd-vh-20171014t193956-20171014t194021-007830-00dd36-002_filter

s1b-iw-grd-vv-20171014t193956-20171014t194021-007830-00dd36-001_filter

s1b-iw-grd-vv-20171014t193956-20171014t194021-007830-00dd36-001_winddir

s1b-iw-grd-vh-20171014t193956-20171014t194021-007830-00dd36-002_winddir