undef

s1b-iw-grd-vh-20170909t233422-20170909t233447-007322-00cea5-002_filter

s1b-iw-grd-vv-20170909t233422-20170909t233447-007322-00cea5-001_filter

s1b-iw-grd-vh-20170909t233422-20170909t233447-007322-00cea5-002_winddir

s1b-iw-grd-vv-20170909t233422-20170909t233447-007322-00cea5-001_winddir