undef

s1a-iw-grd-vh-20190912t093330-20190912t093355-028986-0349a8-002_filter

s1a-iw-grd-vv-20190912t093330-20190912t093355-028986-0349a8-001_filter

s1a-iw-grd-vh-20190912t093330-20190912t093355-028986-0349a8-002_winddir

s1a-iw-grd-vv-20190912t093330-20190912t093355-028986-0349a8-001_winddir