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《Geomatics and Information Science of Wuhan University》 2015-02
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Terrain Simplification from Grid DEMs Based on Local Moran's I Index

ZHU Dan;DONG Youfu;College of Geomatics Engineering,Nanjing University of Technology;  
Terrain simplification algorithms from grid DEMs of high resolution offer an effective solution for constructing multi-scale DEMs.This paper presents a simple method for simplifying terrain from dense grid DEMs based on a grid cell's spatial autocorrelation.A simplified DEMs is reconstructed 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 5mDEMs.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.
【Fund】: 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)~~
【CateGory Index】: P208
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