undef
s1a-ew-grd-vv-20181006t140456-20181006t140600-024016-029fbe-001_filter
s1a-ew-grd-vh-20181006t140456-20181006t140600-024016-029fbe-002_filter
s1a-ew-grd-vv-20181006t140456-20181006t140600-024016-029fbe-001_winddir
s1a-ew-grd-vh-20181006t140456-20181006t140600-024016-029fbe-002_winddir