undef
s1b-ew-grd-vh-20180902t143812-20180902t143912-012537-01720f-002_filter
s1b-ew-grd-vv-20180902t143812-20180902t143912-012537-01720f-001_filter
s1b-ew-grd-vv-20180902t143812-20180902t143912-012537-01720f-001_winddir
s1b-ew-grd-vh-20180902t143812-20180902t143912-012537-01720f-002_winddir