基于DEM坡度坡向算法精度的分析研究.pdf

33 3 Vol. 33, No. 3 2004 8 ACTA GEODAET ICA et CART OGRAPHICA SINICA Aug. , 2004 : 1001- 15 5(2004) 03-0258-06 : P208 :A DEM 1, 4 2 3 1 刘学军 , 龚健雅 , 周启鸣 , 汤国安 ( 1. , 2100 7; 2. , 43007 ; 3. , ; 4. , 4 10076 ) A Study of Accuracy and Algorithms for Calculating Slope and Aspect Based on Grid Digital Elevation Model(DEM) 1, 4 2 3 1 LIU Xue-jun , GONG Jian-ya , ZHOU Q-i ming , TANG Guo-an ( 1. N anj ing Normal University , N anj ing 2100 7, China; 2. N ational Key laboratory f or I nf ormation Engi- neering in Surveying , M a ing and Remote Sensing, Wuhan University , Wuhan 43007 , China ; 3. H ong K ong Ba tist University, H ong Kong , China , 4. Changsha Science and Technology Univ ersity, Changsha 71006 , China) Abstract: 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 conclu- sions of this paper clarified some existing mistakes of slope and aspect accuracy and algorithms. Key ords: DEM; slope; aspect; algorit hm; accuracy : 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 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 盾结论 : 数字地面模型; 坡度; 坡向; 算法; 精度 ( Geo- 1