undef
s1b-iw-grd-vh-20170909t110228-20170909t110253-007314-00ce68-002_filter
s1b-iw-grd-vv-20170909t110228-20170909t110253-007314-00ce68-001_filter
s1b-iw-grd-vv-20170909t110228-20170909t110253-007314-00ce68-001_winddir
s1b-iw-grd-vh-20170909t110228-20170909t110253-007314-00ce68-002_winddir