基于Strahler积分的DEM精度评价模型

DEM Accuracy Model Based on Area-altitude Analysis of Strahler

提出了一种新的基于规则格网DEM的Strahler积分算法,并在此基础上提出了DEM的Strahler积分精度评价模型.该模型利用Strahler积分值表达规则格网DEM的整体误差,同时在一定程度上体现了DEM误差的空间分布,避免了常用DEM中误差模型的不唯一性以及等高线套合难以定量化的缺点.

A new model which could evaluate the accuracy of Grid digital elevation model （ Grid DEM） is recommended to study both the DEM＇ s quantitative global error and its error distribution by area-altitude analysis of A. N. Strahler which is widely used in geomorphology. Further, a new arithmetic which would calculate the Strahler＇ s curve and its integral quantity quickly and uniquely is designed to support this model. To ensure its reliability, additionally, a comparison between this model and root mean square error （RMSE） based on three different sets of Grid DEM data interpolated from the same contour data is also discussed at the end of the paper.