UnityEditor.TerrainMenus.GetActiveTerrain C# (CSharp) Method

        private static Terrain GetActiveTerrain()
        {
            Object[] filtered = Selection.GetFiltered(typeof(Terrain), SelectionMode.Editable);
            if (filtered.Length != 0)
            {
                return (filtered[0] as Terrain);
            }
            return Terrain.activeTerrain;
        }

 private static TerrainData GetActiveTerrainData()
 {
     if (TerrainMenus.GetActiveTerrain())
     {
         return(TerrainMenus.GetActiveTerrain().terrainData);
     }
     return(null);
 }