undef

s1b-iw-grd-vh-20180912t042156-20180912t042221-012677-017649-002_filter

s1b-iw-grd-vv-20180912t042156-20180912t042221-012677-017649-001_filter

s1b-iw-grd-vv-20180912t042156-20180912t042221-012677-017649-001_winddir

s1b-iw-grd-vh-20180912t042156-20180912t042221-012677-017649-002_winddir