规则格网模型转换为三角网模型的新方法  

New Method for Transforming Regular GRID to TIN Model

作　　者：李功权[1] 

机构地区：[1]长江大学地球科学学院,湖北荆州434023

出　　处：《长江大学学报（自然科学版）》2011年第4期68-70,286-287,共3页Journal of Yangtze University(Natural Science Edition)

基　　金：湖北省高等学校优秀中青年科技创新团队项目(T200602)

摘　　要：在保留重要点法的基础上,根据GRID与TIN模型的特性,设计了一个新的模板——"方孔钱"模板,此模板考虑了纵、横、对角3个方向上的情况,还兼顾了以节点为圆心,2倍网格步长度为半径的圆作为搜索方向。通过对一个在纵向上分布为3个山脊和2个山谷,且山脊与山谷之间有的坡度陡峭,有的坡度平缓的网格数据模型的测试说明,该算法不但很好地保留了关键网格点(顶点、凹点),最大限度地消除了冗余高程点,消除率达50%以上;而且保证了转换前后模型的精度。A new template like a circular coin with a square hole is designed based on VIP method which considers the characteristics of GRID and TIN model.Not only three directions,north to south,east to west and diagonal line are included,but also a circle whose centre is a node and the radius is two times steps of GRID as a searching direction.A test grid model which has three ridges and two valleys distributed along north to south is chosen.Some slopes are steep and some valleys are gentle in the areas between ridges and valleys.The result shows that it not only better remains the key points and maximally removes the redundancy points that the percentage is above 50% and the precision is kept well.So it can be used in practice.

关 键 词：GRID TIN 三维可视化 模板 数字高程模型 

分 类 号：TP311[自动化与计算机技术—计算机软件与理论]