基于空间自相关的地形建模简化研究  

Research on simplification method of terrain modeling based on spatial-autocorrelation

作　　者：吴晓彦[1] 顾韵华[1] 张俊勇[1] 

机构地区：[1]南京信息工程大学计算机与软件学院,南京210044

出　　处：《信息技术》2014年第12期64-68,共5页Information Technology

基　　金：科技部公益性行业(气象)科研专项(GYHY201106024)

摘　　要：针对基于数字高程模型(Digital Elevation Model,DEM)数据的大规模三维地形简化问题,提出了基于空间自相关理论的地形建模简化方法。该方法考虑地形坡度这一表达地形特征关键因素,以地貌特征区域相似与高程数据相关性为依据,对地形数据进行聚类分析,获取区分地形的特征值,在此基础上采用基于倾斜度的距离加权法计算中心点的高程值,生成新的网格进行地形构建。实验结果表明,该方法一定程度上降低了数据规模,减少了相对误差,同时较好的保持了地形特征。To solve the problem of three-dimensional terrain simplification in large-scale which was based on digital elevation model（DEM） data, a terrain simplified method based on the theory of spatial autocorrelation was proposed. The slope, a key factor for expressing the terrain features, has been taken into account in this method. According to principle of regional similarities in geomorphology is related to DEM data correlation, a cluster analysis was performed on the terrain data to get the thresholds distinguish terrain features. On the basis, the gradient-based distance-weighted method was adopted to fit elevation values of the center point and generated a new terrain mesh. The results of experiments show that the method to some extent reduces the size of the data and the relative error, while maintaining good terrain features.

关 键 词：空间自相关 地形简化 数字高程模型 倾斜度 

分 类 号：TP391[自动化与计算机技术—计算机应用技术] P207[自动化与计算机技术—计算机科学与技术]