undef

s1a-ew-grd-vv-20180209t135129-20180209t135229-020530-0231f9-001_filter

s1a-ew-grd-vh-20180209t135129-20180209t135229-020530-0231f9-002_filter

s1a-ew-grd-vv-20180209t135129-20180209t135229-020530-0231f9-001_winddir

s1a-ew-grd-vh-20180209t135129-20180209t135229-020530-0231f9-002_winddir