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- Title
Terrain Simplification from Grid DEMs Based on Local Moran's I Index.
- Authors
ZHU Dan; DONG You fu
- Abstract
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 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.
- Publication
Geomatics & Information Science of Wuhan University, 2015, Vol 40, Issue 2, p280
- ISSN
1671-8860
- Publication type
Article
- DOI
10.13203/j.whugis20130085