计算机工程与应用 ›› 2008, Vol. 44 ›› Issue (33): 208-210.DOI: 10.3778/j.issn.1002-8331.2008.33.063

• 工程与应用 • 上一篇    下一篇

基于渐进式传输的嵌入式WebGIS平台的研究

王兴强1,2,贾智平1,李秀桥1,卢 昕3   

  1. 1.山东大学 计算机科学与技术学院,济南 250061
    2.中国人民解放军72517部队,济南 250000
    3.北京石油化工学院 经济管理学院,北京 102600
  • 收稿日期:2007-12-11 修回日期:2008-03-10 出版日期:2008-11-21 发布日期:2008-11-21
  • 通讯作者: 王兴强

Research on embedded WebGIS based on progressive transmission

WANG Xing-qiang1,2,JIA Zhi-ping1,LI Xiu-qiao1,LU Xin3   

  1. 1.Department of Computer Science and Technology,Shandong University,Jinan 250061,China
    2.Army 72517 of PLA,Jinan 250000,China
    3.Department of Economics Management,Beijing Institute of Petrochimical Technology,Beijing 102600,China
  • Received:2007-12-11 Revised:2008-03-10 Online:2008-11-21 Published:2008-11-21
  • Contact: WANG Xing-qiang

摘要: 为满足海洋监测系统中GIS空间数据实时发布的要求,在深入讨论矢量数据渐进式传输及相关模型的基础上,提出一种新的基于多路搜索树的变种树即等级搜索树的增量存储模型。该方法运用DP算法和失高分级算法来提取不同分辨率的数据,以等级搜索树作为数据缓冲增量存储模型,采用SVG技术生成矢量地图。实验表明,该模型适用于嵌入式WebGIS平台进行矢量数据渐进式传输,可行且高效,提高了实时性,并节省带宽。

关键词: 渐进式传输, WebGIS, 等级搜索树, 可缩放的矢量图形(SVG)

Abstract: In order to satisfy real-time publication requirements of GIS spatial data in marine oberservation system,a novel incremental storage model,based on thorough discussion of models for progressive transmission of vector spatial data,adopted an variant multi-way search tree named level search tree,is introduced.In the proposed method,a classic Douglas-Peucker (DP) algorithm and a new vector height classification algorithm are adopted to retrieve spatial data with diverse resolution and then the new level search tree is introduced as the incremental data buffer storage model.Finally,vector maps are created using SVG technique.The experiments in the end also demonstrates the applicability,feasibility and efficiency of this new model on embedded WebGIS platform,and it enhances its real-time ability while saving much bandwidth.

Key words: progressive transmission, WebGIS, level search tree, Scalable Vector Graphics(SVG)