Constraints of Progressive Transmission of Spatial Data on the Web  

作　　者：AI Tinghua 

机构地区：[1]School of Resource and Environment Sciences, Wuhan University, 129 Luoyu Road, Wuhan 430079, China

出　　处：《Geo-Spatial Information Science》2010年第2期85-92,共8页地球空间信息科学学报（英文）

基　　金：Supported by the National Natural Science Foundation of China(No.40971242);the National High Technology Research and Development Program of China(No.2007AA12Z209,No.2009AA121404)

摘　　要：The progressive transmission of map data on the World Wide Web provides the user with a self-adaptive strategy to access remote data. It not only speeds up the web transfer but also offers an efficient navigation guide for information acquisition. The key technology in this transmission is the efficient multiple representation of spatial data and pre-organization on the server site. This paper aims at progressive transmission investigating some constraints from three aspects: data organization on server site, data control in the transmission process and data restore after reaching the client. Two strategies, namely on-line map generalization and off-line map generalization, are examined respectively for this kind of progressive transmission.The progressive transmission of map data on the World Wide Web provides the user with a self-adaptive strategy to ac- cess remote data. It not only speeds up the web transfer but also offers an efficient navigation guide for information acquisition. The key technology in this transmission is the efficient multiple representation of spatial data and pre-organization on the server site. This paper aims at progressive transmission investigating some constraints from three aspects： data organization on server site, data control in the transmission process and data restore after reaching the client. Two strategies, namely on-line map generalization and off-line map generalization, are examined respectively for this kind of progressive transmission.

关 键 词：progressive transmission map generalization spatial resolution 

分 类 号：P208[天文地球—地图制图学与地理信息工程] P283.7[天文地球—测绘科学与技术]