项目名称: 面向地图可视的矢量数据流式渐进传输研究
项目编号: No.41201411
项目类型: 青年科学基金项目
立项/批准年度: 2013
项目学科: 地理学
项目作者: 宋佳
作者单位: 中国科学院地理科学与资源研究所
项目金额: 25万元
中文摘要: 矢量数据渐进传输研究在解决因大数据量和有限的网络传输速度矛盾所致的传输瓶颈问题具有现实意义。已有的研究主要集中于几何对象的化简与多尺度组织,在地物要素的渐进选取和网络渐进传输机制研究尚显薄弱,一定程度上限制了矢量数据渐进传输的实际应用。本项目瞄准网络环境下矢量地图可视中"边传输边显示"的应用需求,研究(1)基于信息熵构建地物要素重要性的量化模型,作为地物要素渐进选取的依据;(2)引入RTP实时传输协议,研究流式渐进传输机制及地物要素的RTP组包算法和传输质量控制算法;(3)从算法误差、压缩比、时间效率的角度对比四种典型曲线化简算法,确定适于本研究的曲线化简最优算法并设计多尺度组织结构;(4)构建原型系统,选择大数据量矢量数据开展地图渐进可视化应用的数据实验。通过本研究将丰富矢量数据渐进传输的研究思路,使其不仅限于理论方法的讨论,对推进其实际应用及地图信息传输发展具有现实意义和科学价值。
中文关键词: 渐进传输;信息量;实时传输协议;空间要素;可视化
英文摘要: It is realistic significance that the vector data progressive transmission is applied to solving the bottleneck of data transfer between massive data and limited network band width. The related researches mainly focus on simplification of geometry objects and multi-scale organization, but rarely discuss on the selection of geographic features and transfering mechanism over the Internet. The research aims to the applied demands of vector data visualization over the Internet, discuss the following several problems:(1) The quantified model for the importance of geographic features;(2) The transferring mechanisms of streaming progressive transmission and the algorithm for packaging RTP package;(3) The comparison of four typical algorithms for curve simplification on errors, compression ratio, efficiency and the organization structure of multi-scale; (4) The construction of the prototype system and data experiment. The approach to progressive transmission of vector data will be widened based on the research. And it is helpful to the development and practical application of the research on map information transmission.
英文关键词: progressive transmission;quantity of information;real-time transport protocol;spatial feature;visualization