UnityEditor.TerrainMenus.CreateTerrain C# (CSharp) Method

        private static void CreateTerrain(MenuCommand menuCommand)
        {
            TerrainData asset = new TerrainData {
                heightmapResolution = 0x401,
                size = new Vector3(1000f, 600f, 1000f),
                heightmapResolution = 0x200,
                baseMapResolution = 0x400
            };
            asset.SetDetailResolution(0x400, asset.detailResolutionPerPatch);
            AssetDatabase.CreateAsset(asset, AssetDatabase.GenerateUniqueAssetPath("Assets/New Terrain.asset"));
            GameObject context = menuCommand.context as GameObject;
            string uniqueNameForSibling = GameObjectUtility.GetUniqueNameForSibling((context == null) ? null : context.transform, "Terrain");
            GameObject child = Terrain.CreateTerrainGameObject(asset);
            child.name = uniqueNameForSibling;
            GameObjectUtility.SetParentAndAlign(child, context);
            Selection.activeObject = child;
            Undo.RegisterCreatedObjectUndo(child, "Create terrain");
        }