undef

s1b-iw-grd-vv-20170909t084915-20170909t084944-007313-00ce61-001_filter

s1b-iw-grd-vh-20170909t084915-20170909t084944-007313-00ce61-002_filter

s1b-iw-grd-vh-20170909t084915-20170909t084944-007313-00ce61-002_winddir

s1b-iw-grd-vv-20170909t084915-20170909t084944-007313-00ce61-001_winddir