undef
s1b-iw-grd-vh-20171014t193931-20171014t193956-007830-00dd36-002_filter
s1b-iw-grd-vv-20171014t193931-20171014t193956-007830-00dd36-001_filter
s1b-iw-grd-vv-20171014t193931-20171014t193956-007830-00dd36-001_winddir
s1b-iw-grd-vh-20171014t193931-20171014t193956-007830-00dd36-002_winddir