摘要
数字高程模型(DEM)应用十分广阔。本文通过实际存在的对地面两种不同认识论观点的分析,阐明地面是多个单元曲面,它们是在复杂的地形结构线上拼接而成的确定表面,那种把地面或其局部视为随机曲面的观点不符合人类生活和生产实践;通过对系统误差和偶然误差性质概念和DEM生产过程的分析,指出DEM的总体误差以偶然误差概而论之,完全忽视了内插过程并错判了内插误差的性质;同时,对DEM的偶然误差计算中前提的设置、计算推理链的问题进行一定分析,揭示偶然误差论在实践中难予解脱的困境,并进一步阐述了它对DEM误差检核方法、标准的不良影响和对质量的危害。因此希望重视这一重要理论问题,开展讨论,澄清疑虑,促进问题的解决。
DEM（Digital Elevation Model） is the model of terrain and relief, and also a fundamental digital product of the nation. It has been widely used in many areas. The author firstly analyses two existing diverse epistemological viewpoints of the ground, and then clarifies that the ground exterior is a certain exterior which consists of several curved surfaces based on complicated terrain frame lines, indicating that the viewpoint which regards the ground exterior or part of it as a stochastic surface does not tally with human life and production practice. Through the property analysis of system errors and accidental errors together with the analysis of DEM production, the author also indicates that using only accidental errors to estimate DEM errors ignores the process of interpolation and gives out an incorrect property of interpolation errors. At the same time the premise setting and some mistakes in the process of illation in DEM accidental error calculating are discussed in the paper. Finally the author points out that using accidental errors to estimate DEM errors has been in hot water and does great harm to the check method and standard of DEM errors, so as to reduce the quality of DEM products.
出处
《地球信息科学》
CSCD
2005年第3期28-33,共6页
Geo-information Science
关键词
DEM误差分析
随机误差
逼近误差
数值逼近
DEM质量
DEM error analysis
random errors
approximation errors
numerical approximation
DEM quantity
