==External links==* A discussion of the Quadtree and an application* Considerable discussion and demonstrations of Spatial Indexing* Javascript Implementation of the QuadTree used for collision detection* Java Implementation* Java tutorial* C++ Implementation of a Quadtree used for spatial indexing of triangles* Objective-C implementation of QuadTree used for GPS clustering* SquareLanguage* Working demonstration of Quadtree algorithm in Javascript* MIT licensed Quadtree library in Javascript
* Java quad tree example and explanation* A discussion of the Quadtree and an application* Considerable discussion and demonstrations of Spatial Indexing* Example C# code for a quad tree* Javascript Implementation of the QuadTree used for collision detection* C++ Implementation of a QuadTree used for spatial indexing of triangles* Quadtree Search JavaScript implementation