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《Acta Geodaetica Et Cartographic Sinica》 2001-04
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A Simulation on the Accuracy of DEM Terrain Representation

TANG Guo an 1, GONG Jian ya 2, CHEN Zheng jiang 1, CHENG Yan hui 1, WANG Zhan hong 1 (1. Department of Geography,Northwest University, Xi'an 710069,China; 2. National Laboratory for Information Engineering in Survey, Mapping and Remote Sensing  
This research puts forward the concept of DEM terrain representation error (Et) first and then investigates the generation, major factors,measurement and simulation of Et. A multi resolution and multi relief comparative approach was used as the major methodology in this study. The experiment reveals a quantitative relationship between the errors and the variation of DEM resolution and terrain roughness at global levels. RMS Et is regressed against the mean profile curvature ( V ) and DEM resolution ( X ) at 6 resolution levels. It is found that the RMS Et may be expressed as RMS Et=(0.006 3 V+0.006 6)R-0.022 V +0.241 5. This founding should be helpful in calculating DEM accuracy, as well as determining the DEM resolution appropriate to the accuracy requirement of a particular application.
【Fund】: 国家自然科学基金资助项目 ( 4 99710 6 5 );; 教育部资助优秀青年教师基金资助项目;; 测绘遥感信息工程国家重点实验室开 放研究基金资助项目 ( WKL99-0 32 0 );; 大陆动力学教育部重点实验室高级访问学者研究基金资助项目
【CateGory Index】: P208
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