undef
s1b-iw-grd-vv-20181010t233653-20181010t233718-013097-01832e-001_filter
s1b-iw-grd-vh-20181010t233653-20181010t233718-013097-01832e-002_filter
s1b-iw-grd-vv-20181010t233653-20181010t233718-013097-01832e-001_winddir
s1b-iw-grd-vh-20181010t233653-20181010t233718-013097-01832e-002_winddir