undef

s1b-iw-grd-vh-20170920t102254-20170920t102319-007474-00d31f-002_filter

s1b-iw-grd-vv-20170920t102254-20170920t102319-007474-00d31f-001_filter

s1b-iw-grd-vv-20170920t102254-20170920t102319-007474-00d31f-001_winddir

s1b-iw-grd-vh-20170920t102254-20170920t102319-007474-00d31f-002_winddir