利用局部Moran’s I指数进行DEM地形简化  

Terrain Simplification from Grid DEMs Based on Local Moran's I Index

作　　者：朱丹[1] 董有福[1] 

机构地区：[1]南京工业大学测绘学院,江苏南京210009

出　　处：《武汉大学学报（信息科学版）》2015年第2期280-284,共5页Geomatics and Information Science of Wuhan University

基　　金：国家自然科学基金资助项目(41101360;41101348);江苏省高校自然科学研究基金资助项目(11KJB420001)~~

摘　　要：地形简化是构建多尺度DEM数据库的重要技术。基于DEM地形数据空间自相关特征,提出了一种利用Moran’s I指数的DEM简化方案,即在计算DEM格网单元局部Moran’s I指数的基础上,通过设定阈值提取候选地形特征点,进而重构结果 DEM。以黄土丘陵沟壑区为实验样区,将重要点法作为对比算法,从候选特征点分布、高程统计参数、地形结构特征等方面,对该方法的地形简化效果进行了分析。实验结果表明,基于地形空间自相关特征的DEM地形简化方法原理明确,技术方案易于实现,执行效率高,相对于重要点VIP地形简化算法,重构DEM能较好地保持地形的结构特征。Terrain simplification algorithms from grid DEMs of high resolution offer an e tion for constructing multi-scale from dense grid DEMs based on DEMs. This paper presents a simple method a grid cell＇s spatial autocorrelation. A simplifie for simpl ffective soluifying terrain d DEMs is reconstruc ted by calculating local Moran＇s I index for DEM cells with terrain feature points obtained with an appropriate Moran＇s I threshold value. The effect of reconstructed DEMs was evaluated for a test site in an area in loess hilly-gully region with 5 m DEMs. The values for elevation statistical parameters, the structure of terrain feature lines and slope values are aquired from the DEMs reconstructed by the local Moran＇s I index and very important points（VIP） algorithm. Experiment results with a comparison to the VIP method show that the proposed algorithm is clear easy procedure, and highly efficient; it delivers near-perfect precision retaining the geo-morphological skeleton by analyzing spatial distribution of surface-specific structural points used to reconstruct new DEMs.

关 键 词：DEM 空间自相关 局部Moran’s I指数 地形简化 

分 类 号：P231.5[天文地球—摄影测量与遥感] P208[天文地球—测绘科学与技术]