面状要素渐进式传输中几何信息传递状况的定量分析方法  

A Quantitative Analysis of Geometrical Information Transfer in Progressive Transmission of Area Features

作　　者：刘慧敏[1] 何占军[1] 邓敏[1] 徐震[1] 

机构地区：[1]中南大学地球科学与信息物理学院,湖南长沙410083

出　　处：《测绘科学技术学报》2013年第2期191-196,共6页Journal of Geomatics Science and Technology

基　　金：国家自然科学基金项目(41171351);中南大学中央高校基本科研业务费青年教师助推项目;江西省数字国土重点实验室2012年度开放基金项目(DLLJ201204)

摘　　要：渐进式传输是空间数据在网络环境下空间数据多重表达的重要传输方式,可以满足用户对空间数据不同层次细节信息的需求,提高地图网络服务的效率。对传输过程中信息传递状况进行定量分析有利于用户对传输过程进行实时控制。此处以变化累积模型为例,研究了面状要素的渐进式传输过程中几何信息传递状况的分析方法。首先,从空间认知角度基于面状要素的形状凸包分解,研究并提出了基于凸包的面状要素几何信息量度量方法。然后,分析了渐进式传输过程中空间信息传递状况,建立了渐进式传输过程的几何信息传递状况评价指标。最后,通过实验分析几何信息传递状况分析法的合理性,验证了几何信息量传递状况评价方法指导渐进式传输过程控制的有效性。As an efficient way of data transmission over Web, the progressive transmission plays an important role in the multi-representation of spatial data. It is able to meet the need of different levels of spatial information for the users, thus reaches to the efficiency of map service. Quantitative analysis of spatial information content in the process of progressive transmission makes it possible to control the real time transmission process. For this pur- pose, the changes accumulation model of an area feature was taken as the model of information transfer, and fur- ther the information theory was employed to analyze quantitatively the geometrical information transferred in the progressive transmission of area features. Firstly, a partition bases on convex hull of an area feature was proposed from the view of spatial cognition and a quantitative measurement of the information content for a convex hull was proposed. Secondly, a set of evaluation indicators of transmission information were put forward to the quantitative a- nalysis of transfer status. Finally, an experiment was provided to prove the accuracy and efficiency in controlling the transmission process of the proposed method to improve the geometrical information transmission efficiency.

关 键 词：渐进式传输 信息量 变化累积模型 面状要素 信息传递 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]