undef

s1b-iw-grd-vv-20170909t233537-20170909t233602-007322-00cea5-001_filter

s1b-iw-grd-vh-20170909t233537-20170909t233602-007322-00cea5-002_filter

s1b-iw-grd-vv-20170909t233537-20170909t233602-007322-00cea5-001_winddir

s1b-iw-grd-vh-20170909t233537-20170909t233602-007322-00cea5-002_winddir