数字高程模型(DEM)的整体误差分析

¹信息工程大学理学院,郑州市科学大道62号450001;²南京师范大学虚拟地理环境教育部重点实验室,南京市文苑路1号210046;³信息工程大学测绘学院,郑州市陇海中路66号450052

基金项目: 国家自然科学基金资助项目(40501058)

详细信息

Global Error Analysis of DEM Models

¹Institute of Science,Information Engineering University,62 Kexue Road,Zhengzhou 450001,China;²Key Laboratory of Virtual Geographic Environment,Ministry of Education,Nanjing Normal University, 1 Wenyuan Road,Nanjing 210046,China;³Institute of Surveying and Mapping,Information Engineering University,66 Middle Longhai Road,Zhengzhou 450052,China

Funds: 国家自然科学基金资助项目(40501058)

摘要: 对增加了服从正态分布的随机误差的数学曲面上DEM模型的整体误差与地形、内插方法和原始数据的质量之间关系进行研究,得出不同地形、不同的DEM表面模型的整体误差不同,不同的DEM模型在不同地形时对原始格网数据误差的敏感程度不同。
- DEM /
- 传递误差 /
- 地形模拟误差 /
- 整体误差
Abstract: The global error of digital elevation model(DEM) comprises the propagation error of grid data and the simulation error of terrain represented by interpolation method.The experimental results show that the differences of different DEMs' global errors reduce gradually with the original data error increased in same terrains,in the end to zero.In different terrains,the DEM's global error is different when the original data error is different even if the interpolation method is the identical.As shown in experiment,the precision of digital elevation model not only relates to sampling intervals and terrain complexity but also relates to interpolation methods and original data errors.Different DEMs have different sensitivity to original data error in different terrains.Hence,we present the way to select appropriate interpolation method.
- DEM /
- propagation error /
- terrain simulation error /
- global error