LBS中基于SVG的空间数据表达与压缩

摘要

针对位置服务系统中移动端矢量空间数据的有效组织问题,对现有方案进行比较和拓展,提出一套新的基于可伸缩矢量图形(SVG)的数据表达和压缩的系统解决方案,重点研究并解决了利用表达的精简和GZIP压缩相结合的改进方法实现数据压缩的关键技术.实验结果表明,SVG格式适用于位置服务中对空间数据的表达,且改进的压缩方式优于传统压缩算法,验证了技术方案的可行性.%It is known that how to organize effectively geodata of mobile device in LBS ( location based services ) are organized ineffectively.So after the existing solutions are compared and extended in the paper, a new SVG( scalable vector graphic) based solution is provided to represent and compress spatial data.Then the key technologies in the fields of SVG data representation and compression are researched and resolved, in which the improved compression method combined simplified SVG representation and GZIP compression.The test result showed that SVG based method is appropriate to represent geodata in LBS, and the improved method to compress SVG based data is better than traditional method, in which the feasibility of the solution is validated.