地理研究

地理研究 ›› 2004, Vol. 23 ›› Issue (2): 265-273.doi: 10.11821/yj2004020015

• 论文 • 上一篇    下一篇

三维景观GIS几何建模方法——以无锡唐城为例

姜永发1,2, 闾国年1, 彭世揆3   

  1. 1. 南京师范大学地理信息科学江苏省重点实验室,南京210013;
    2. 南京林业大学森林资源与环境学院 南京210097;
    3. 江苏省基础地理信息中心,南京210037
  • 收稿日期:2003-07-20 修回日期:2004-01-31 出版日期:2004-04-15 发布日期:2004-04-15
  • 作者简介:姜永发(1972-),男,浙江金华人,工程师,在读博士生。主要从事GIS应用与开发和虚拟现实技术 研究,已发表论文近10篇。E-mail:gis-nj@163.com
  • 基金资助:

    国家高新技术发展规划(863)项目(2001AA135130);南京师范大学”211工程”二期重点学科支持(2002)

Research on geometry modeling method of three-dimensions landscape GIS: a case study of Tangcheng in Wuxi

JIANG Yong-fa1,2, LV Guo-nian1, PENG Shi-kui3   

  1. 1. Key Lab of Jiangsu of Geographic Information Science, Nanjing Normal University, Nanjing 210097, China;
    2. Jiangsu Fundamental Geographic Information Center, Nanjing 210013, China;
    3. College of Forest Resources and Environment,Nanjing Forestry University,Nanjing 210037, China
  • Received:2003-07-20 Revised:2004-01-31 Online:2004-04-15 Published:2004-04-15

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摘要：

本文实现了以 4D测绘数据 (DEM、DOM、DLG、DRG)为基本数据源的无锡唐城古建筑三维数字景观GIS。同时 ,在三维GIS传统三维空间数据模型的基础上 ,提出面向对象的三维建模点对象的划分不同与二维GIS中的点对象 ;针对基于面状的三维GIS,提出有向曲线构建面状复杂单体的几何建模方法是较为简捷的途径。

关键词: 4D测绘数据, 几何建模, 有向曲线D surveying and mapping data, geometry modeling, oriented curves

Abstract:

Starting from the three dimensions and virtual reality, the hot spots of ”digital Earth” and ”digital city” of GIS,this paper analyses the development status of 3D visualization GIS at home and abroad, and discourse upon the key technologies of 3D-GIS. In view of the specialty of surveying and mapping, the 3D cyber-landscape GIS in Tangcheng of Wuxi was realized based on 4D surveying and mapping data(DEM,DOM,DLG,DRG). In addition, some modifications on traditional 3D spatial data model of GIS were made.The authors think that the division of point object in 3D modeling of object-oriented is different from that of 2D GIS.The single tree of the generally defined point object is usually composed of bulk data storage and one of the difficult technologies of GIS modeling. At the same time, the authors think that the way of using oriented curves for modeling complicated geometric objects is simple and direct. Based on oriented curves the paper makes several descriptions for common geometric objects, and puts forward the mathematical way which constructs simple surface object and complex 3D objects. As a basic data stream, 4D of surveying and mapping data was modeled by automatic and manual ways through digital technology for editing textures of buildings and linking their attribute data, then the 3D landscape reappearance and virtual reality of Tangcheng scenic spot were completed.

Key words: D surveying and mapping data, geometry modeling, oriented curves