基于DEM坡度坡向算法精度的分析研究

A Study of Accuracy and Algorithms for Calculating Slope and Aspect Based on Grid Digital Elevation Model(DEM)

坡度坡向是两个最基本的地形因子,目前对DEM坡度坡向计算模型和精度存在一些不同的甚至矛盾的观点,其原因在于没有区分误差来源和分析评价方法的不同。本文对DEM坡度坡向误差进行了理论分析,并通过实验数据对相关结论进行了验证。旨在澄清目前关于坡度坡向计算模型上的矛盾结论。

Slope and aspect is the most frequently used terrain parameters in Geo-science models such as hydrological models and soil erosion models of Geological Information System (GIS). But there are some misunderstanding on slope and aspect accuracy and algorithms based on Digital Elevation Model (DEM). The accuracy of slope and aspect is studied and six slope algorithms are compared, The results are confirmed on data independent DEM. The conclusions of this paper clarified some existing mistakes of slope and aspect accuracy and algorithms.