LOD技术与制图综合在多尺度地图适时显示中的应用研究

多尺度地图适时显示是电子地图可视化过程中的瓶颈问题,在这一领域人们已经探索出不少行之有效的方法。本文将一种三维场景复杂程度控制技术———LOD技术,结合传统的制图综合技术,用于电子地图可视化。通过对地理要素分类建立LOD模型,其中地理要素的分类方法,以及LOD层次参数的设定,综合算法的选取等提出一些理论依据,旨在为电子地图可视化提供一个标准和数学依据。并已通过《深圳市龙岗电子地图集》制作项目的实践,初步实践了这一技术结合。

Research on the visualization of multi-scale cartographic with LOD technology and cartographic generalization

The visualization of multi-scale cartographic has been one of the bottleneck problems in the realization of electronic maps.People have found some effective methods to solve this problem.This paper uses LOD(a method applied in making three dimension models)and cartographic generalization to realize visualization of electronic map.By constructing some specific geographic feature's LOD models,the paper provides a standard and a mathematics method to visualize electronic maps.At the same time,the sort methods of geographic features,the setting of LOD level parameters and some integrated arithmetic are discussed.The method has been realized in the projects of Longgang electronic atlas.