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《Science of Surveying and Mapping》 2006-05
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Error analysis on DEM-based terrain curvatures models

LIU Xue-jun ①②,WANG Ye-fei ②,CAO Zhi-dong ②,TANG Guo-an ①(①Nanjing Normal University,Nanjing 210097,China;②Changsha Technology and Science University,changsha 410069,China)  
Terrain curvature is one of fundamental variables in geomorphology and geoscience modeling.In this paper,the algorithm used to calculate the terrain curvatures is summarized firstly.Then three quantificational algorithms for the nine terrain curvatures used in our study by data-independence DEM and real DEM are analyzed.We found that higher-order local surface(partial quartic surface)can give more accurate results if the DEM elevation data is very accurate.While if elevation data have a relative error,lower-order local surface(quadratic surface),with its smoothness,can give calculate curvatures accurately.
【Fund】: 国家自然科学基金(40571120 40271089);; 南京师范大学高层次人才科研启动基金项目
【CateGory Index】: TP391.4
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