多视角三维仿真城市地图的实现方法  

Realization Method for Multi-angle 3D Simulation City Map

作　　者：任鹏[1,2] 向南平[1] 胡金星[2] 

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 [2]中国科学院深圳先进技术研究院,广东深圳518055

出　　处：《地理与地理信息科学》2011年第3期34-37,共4页Geography and Geo-Information Science

摘　　要：针对目前三维仿真城市地图展示中单一视角因视线遮挡造成信息丢失的问题,提出了一种多视角三维仿真地图方法,即通过多个可以互相切换的视角对三维仿真城市地图数据进行发布与展示,多视角三维仿真地图具有信息量大、色彩鲜明、形象立体的优点。该文在分析多视角三维仿真地图数据的基础上,给出了数据组织模型,提出了三维仿真地图的多视角逻辑坐标与地理坐标的转换方法,实现了多视角三维仿真城市地图的可视化。Now the three-dimensional simulation city map provide only a fixed view angle to display geo data,which cause the problem of geo data loss inevitably because of map blind point.To a certain extent,this problem limits the expression of geo information.In order to solve the problem,a method named multi-angle three-dimensional simulation city map is put forward in this paper,which display three-dimensional map by many switchable view angles to reduce the geo data lose.This method is divided into three parts to discuss.At first,based on the research of the original pyramid model,a pyramid group model is given,which provides a solution to organize the mass multi-types map data.This model means that a pyramid group includes some sub pyramids;each pyramid is independent,but all sub pyramids adopt uniform codes.In the second part,the three-dimensional simulation city map local coordinate system is customized.And the coordinate transformation method between the local coordinate system and geographic coordinates is discussed,which is based on polynomial model.At last,the realization of map loading,map zooms,map rotation is researched,the obtaining and replacing of map blocks during the foregoing operation is discussed.This method has been successfully used in a public service platform system,whose result shows that the method is efficient in map rotation and increasing the map information.The method will be promising in three-dimensional map service.

关 键 词：三维仿真城市 网络地理信息系统 电子地图 

分 类 号：P208[天文地球—地图制图学与地理信息工程]