undef

s1b-ew-grd-vv-20180902t022508-20180902t022612-012530-0171d9-001_filter

s1b-ew-grd-vh-20180902t022508-20180902t022612-012530-0171d9-002_filter

s1b-ew-grd-vh-20180902t022508-20180902t022612-012530-0171d9-002_winddir

s1b-ew-grd-vv-20180902t022508-20180902t022612-012530-0171d9-001_winddir