Spatial index for tile map service based on Z curve
基于Z曲线的瓦片地图服务空间索引

Tile spatial index is a key technology to improve the tile fetching efficiency and its performance directly affects the overall performance of geographic information network services. This article analyzes the basic principles of grid index and quad-tree index which are widely used in tile map service.Because Z curve has good locality-preserving behavior and a good reduction of dimensionality behavier,we design a new tile spatial index based on Z-curve, called Z-Index. Experimental results show that the performance of Z-Index is better than grid and quad-tree indexing when applied on massive tile datasets.