摘要
目的在于利用小波理论研发分布式交互的在线地理信息系统(DIOGIS)浏览器.文中利用已有的实现纯整数变换的小波算法来实现一个DIOGIS浏览器原型.这个原型表明对一个分级分解地图,被描述的方法可以达到类似JPEG的压缩,使用它在低速网络中传输大量的GIS数据非常有效.进一步说,通过在压缩算法中增加可在网络中执行放大缩小以及平移操作的能力,这个原型能够排除冗余的数据转换并且达到平滑、实时的图像浏览效果.
The purpose of this work is to develop a distributed interactive online geographic information system （DIOGIS） viewer using wavelet theory. A prototype DI-GIS viewer is implemented using a wavelet scheme known as lifting to achieve a pure integer transform. This prototype demonstrates that the described approach can achieve similar compression to JPEG while providing a hierarchical decomposition of maps, which makes it very efficient in transferring large amounts of GIS data over lowspeed networks. In particular, by coupling the compression algorithms with the ability to perform zooming and panning operations over networks, this prototype is able to eliminate redundant data transfer and achieve a smooth real-time image-browsing capability.
出处
《小型微型计算机系统》
CSCD
北大核心
2005年第8期1391-1396,共6页
Journal of Chinese Computer Systems
基金
国家"八六三"高技术研究发展计划专项(2002AA104560)资助
关键词
地理信息系统
成像技术
地图
交互式系统
互连网
geographic information system
imaging techniques
maps
interactive systems
Internet
