关键词: 栅格影像, 并行瓦片化, 消息传递接口（MPI）

Abstract: The map tiles technology are widely used in WebGIS solutions of the current mainstream GIS  software and the Internet map applications, tile processing service is the key technology to realize the fast and seamless browsing on WebGIS. Traditional algorithms and commercial GIS software cannot meet the demand of fast processing large data size raster image tiling. In view of these shortcomings and problems, this paper summarizes the current parallel tiling technology and then puts forward a new parallel raster image tile method which named “ParaTile”. ParaTile adopts the shared disk parallel technology, using multi-process to divide the source raster image. Each process of ParaTile is read and written independently to the area that it is owned based on MPIparallel IO function. Finally, each process saves the output tile results independently according to the TMS（Tile Map Service） or the standard made by Google Tile. Experiments are tested by different level size of the remote sensing image, the results show that no matter in speed or stability ParaTile algorithm has a great improvement in the same parallel level compared to ArcGIS software, especially the larger size of data the more advantages are.

Key words: raster image, parallel tile, Message Passing Interface（MPI）