undef

s1a-ew-grd-vh-20180904t083405-20180904t083509-023546-029075-002_filter

s1a-ew-grd-vv-20180904t083405-20180904t083509-023546-029075-001_filter

s1a-ew-grd-vh-20180904t083405-20180904t083509-023546-029075-002_winddir

s1a-ew-grd-vv-20180904t083405-20180904t083509-023546-029075-001_winddir