随着3维地图的发展,2维地图中的一些注记自动配置规则和方法在3维环境下显得并不适用。在分析3维注记视觉变量及其影响因素的基础上,对3维地形图中面状要素的注记配置规则进行了研究,提出一种基于约束性Delaunay三角网提取面状要素注记定位线、并结合3维地形图中面状要素的符号特征获取注记定位点的3维面状要素注记自动配置方法,在基于ArcEngine的3维地形图自动绘制系统中得到了成功应用。
As the development of 3D map, some principles and methods of the label placement in 2D map are not suitable for 3D environment. The visual variable and the influencing factor of 3D label was analyzed and the automatic placement principles of the label in 3D area feature based on it was studied. The method to extract the anchor line of the label in the area feature was introduced based on the constraint delaunay triangulated network and the 3D coordinates of the anchor point of the label combined with the symbol characteristics was obtained as well as an automatic placement of the label in 3D area feature was achieved. Finally the method was applied to the automatic cartographic system of 3D topographic map based on ArcEngine successfully.