undef

s1a-ew-grd-vh-20160829t214226-20160829t214326-012821-01438b-002_filter

s1a-ew-grd-vv-20160829t214226-20160829t214326-012821-01438b-001_filter

s1a-ew-grd-vh-20160829t214226-20160829t214326-012821-01438b-002_winddir

s1a-ew-grd-vv-20160829t214226-20160829t214326-012821-01438b-001_winddir