undef
s1b-ew-grd-vv-20180818t204503-20180818t204603-012322-016b56-001_filter
s1b-ew-grd-vh-20180818t204503-20180818t204603-012322-016b56-002_filter
s1b-ew-grd-vv-20180818t204503-20180818t204603-012322-016b56-001_winddir
s1b-ew-grd-vh-20180818t204503-20180818t204603-012322-016b56-002_winddir