undef

s1b-iw-grd-vh-20171014t193906-20171014t193931-007830-00dd36-002_filter

s1b-iw-grd-vv-20171014t193906-20171014t193931-007830-00dd36-001_filter

s1b-iw-grd-vh-20171014t193906-20171014t193931-007830-00dd36-002_winddir

s1b-iw-grd-vv-20171014t193906-20171014t193931-007830-00dd36-001_winddir