undef
s1a-ew-grd-vh-20180303t020227-20180303t020327-020844-023bfa-002_filter
s1a-ew-grd-vv-20180303t020227-20180303t020327-020844-023bfa-001_filter
s1a-ew-grd-vv-20180303t020227-20180303t020327-020844-023bfa-001_winddir
s1a-ew-grd-vh-20180303t020227-20180303t020327-020844-023bfa-002_winddir