| DEM线性建模过程中的高程误差传播 |
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| 引用本文： | 李国重,张国芹,朱长青.DEM线性建模过程中的高程误差传播[J].测绘学院学报,2009(4). |
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| 作者姓名： | 李国重 张国芹 朱长青 |
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| 作者单位： | 信息工程大学理学院;南京师范大学虚拟地理环境教育部重点实验室; |
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| 基金项目： | 国家自然科学基金资助项目(40501058) |
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| 摘 要： | 在建立数字高程模型(DEM)时,基于规则格网数据和基于三角形网数据的线性建模是常用的方法。在建模过程中,结点的高程误差会随之传播。研究了DEM在基于规则格网数据和基于三角形网数据的线性建模过程中的高程误差传播问题,推导出了在结点高程误差相关情形下的高程误差传播公式,求出了在规则格网和不规则格网面上的平均高程传播误差。平均高程传播误差可以作为DEM线性插值过程中高程误差传播的度量指标。
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| 关 键 词： | 数字高程模型 规则格网 不规则三角网 线性插值 高程误差 平均高程误差 |
Elevation Error Propagation in Linear Modeling on DEM |
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| LI Guo-zhong,ZHANG Guo-qin,ZHU Chang-qing.Elevation Error Propagation in Linear Modeling on DEM[J].Journal of Institute of Surveying and Mapping,2009(4). |
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| Authors: | LI Guo-zhong ZHANG Guo-qin ZHU Chang-qing |
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| Institution: | 1.Institute of Science;Information Engineering University;Zhengzhou 450001;China;2.Key Laboratory of Virtual Geographic Environment;Nanjing Normal University;Nanjing 210046;China |
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| Abstract: | Based on regular grid data and TIN data,linear modeling is a common method in building DEM.In linear modeling,the elevation error of nodes can be propagated to the elevation error of the interpolated points.The problem of elevation error propagation in the process of linear modeling when building DEM based on regular data and TIN data has been studied.When variance and covariance of the nodes elevation are related,the formula of the elevation propagation error is reduced.And the average elevation propagatio... |
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| Keywords: | DEM regular grid TIN linear interpolation elevation error average elevation error |
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