undef
s1b-iw-grd-vh-20171015t184355-20171015t184420-007844-00dd96-002_filter
s1b-iw-grd-vv-20171015t184355-20171015t184420-007844-00dd96-001_filter
s1b-iw-grd-vv-20171015t184355-20171015t184420-007844-00dd96-001_winddir
s1b-iw-grd-vh-20171015t184355-20171015t184420-007844-00dd96-002_winddir