undef
s1a-iw-grd-vh-20191109t121206-20191109t121231-029834-0366f3-002_filter
s1a-iw-grd-vv-20191109t121206-20191109t121231-029834-0366f3-001_filter
s1a-iw-grd-vv-20191109t121206-20191109t121231-029834-0366f3-001_winddir
s1a-iw-grd-vh-20191109t121206-20191109t121231-029834-0366f3-002_winddir