undef
s1a-iw-grd-vh-20200918t183624-20200918t183649-034417-0400c8-002_filter
s1a-iw-grd-vv-20200918t183624-20200918t183649-034417-0400c8-001_filter
s1a-iw-grd-vh-20200918t183624-20200918t183649-034417-0400c8-002_winddir
s1a-iw-grd-vv-20200918t183624-20200918t183649-034417-0400c8-001_winddir