undef

s1a-ew-grd-vv-20160904t212353-20160904t212453-012908-014671-001_filter

s1a-ew-grd-vh-20160904t212353-20160904t212453-012908-014671-002_filter

s1a-ew-grd-vv-20160904t212353-20160904t212453-012908-014671-001_winddir

s1a-ew-grd-vh-20160904t212353-20160904t212453-012908-014671-002_winddir