一种地形扫描数据误差估算方法  

A method of estimating errors of topographic scanning data

作　　者：师长兴[1] SHI Changxing(Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China)

机构地区：[1]中国科学院地理科学与资源研究所、水循环及地表过程院重点实验室地貌研究室,北京100101

出　　处：《北京测绘》2023年第4期580-583,共4页Beijing Surveying and Mapping

基　　金：国家自然科学基金(41971008,41671004)。

摘　　要：地形观测是研究地表形态特征和地表过程的重要手段,观测数据的误差决定了观测数据的应用范围和分析结果的可信程度。本文基于不规则三角网模型线性插值生成数字高程模型(DEM)的误差可分为插值传递误差和信息损失误差,给出插值传递全局误差计算公式,提出通过随机分组扫描数据,确定组间数字高程模型的误差和信息损失误差,得到插值传递误差,从而获取数据误差的方法。通过用随机数检验,结果可信度高,证明该方法可用于地形扫描数据误差分析。Terrain survey is an important means to study the morphological characteristics and land surface processes,and the error of the topographic scanning data determines the application scope of the topographic data and the credibility of the analysis results.Considering that the error of digital elevation model(DEM)rasterized from triangulated irregular network(TIN)could be divided into propagation error and information loss error,a model of calculating the propagation error were built.On basis of this model,this study put forward a method of determining the propagation error by randomly dividing the topographic data into groups and reckoning the DEM error and the information loss error,and then transforming the propagation error to original data error.This method was tested to be reliable using random data,quantifying it to be applicable for analyzing the errors of topographic scanning data.

关 键 词：地形观测 插值传递误差 信息损失误差 全局误差 数据误差 

分 类 号：P207[天文地球—测绘科学与技术]