undef

s1a-ew-grd-vv-20180904t083609-20180904t083710-023546-029075-001_filter

s1a-ew-grd-vh-20180904t083609-20180904t083710-023546-029075-002_filter

s1a-ew-grd-vv-20180904t083609-20180904t083710-023546-029075-001_winddir

s1a-ew-grd-vh-20180904t083609-20180904t083710-023546-029075-002_winddir