WebGIS多层次矢量数据压缩方法及仿真实现

Method of Multilevel Vector Data Compression for WebGIS

互联网带宽的限制是导致WebGIS数据传输效率低的原因,因此矢量数据压缩对于提高整个WebGIS系统的传输性能是至关重要的。提出了一种多层次的矢量数据压缩方法,融合了适用于WebGIS的有损压缩与编码方式的无损压缩,进一步提高了压缩比率。对该压缩方法的核心部分进行了详细的阐述,最后通过网络地图服务的仿真实验,表明该压缩方法能够达到90%以上的压缩比,并且有效的降低了用户响应时间,这将对WebGIS应用提供更好的探索空间。

The limit of Internet bandwidth is one reason for the inefficiency of WebGIS data transmission,so that vector data compression is important to improve the transmission performance of WebGIS.A multilevel vector data compression method was proposed which included lossy compression applying to WebGIS and lossless compression with encoding.After illustrating the details of the core procedure,a series simulation of web map service was designed to validate the resolution.The result shows the significant compression ratio（about 90%） which can reduce the client-side response time.