undef

s1a-ew-grd-vh-20190928t084413-20190928t084513-029219-0351a9-002_filter

s1a-ew-grd-vv-20190928t084413-20190928t084513-029219-0351a9-001_filter

s1a-ew-grd-vv-20190928t084413-20190928t084513-029219-0351a9-001_winddir

s1a-ew-grd-vh-20190928t084413-20190928t084513-029219-0351a9-002_winddir