Analysis of ASTER GDEM elevation accuracy under different terrain conditions
In this paper,the elevation point data of the 1∶2 000 scale topographic map is used as the elevation reference truth,and the elevation accuracy of the ASTER GDEM model is analyzed by taking the typical high-altitude mountainous areas and low-altitude plains in China as the study area.The error of the ASTER GDEM model is normally distributed as a whole,and the model elevation value is strongly correlated with the reference elevation value.The average elevation error of the ASTER GDEM model in high altitude area is-4.1 m,and the root mean square error is 13.7 m,which is basically the same as the nominal accuracy.The average elevation error of the model in low altitude areas is 2.7 m,and the root mean square error is 5.4 m,which is much higher than the nominal accuracy.There is no obvious trend in the average error of the model at different altitudes,and the standard deviation increases with the increase of altitude.The greater the terrain undulation,the greater the model error.
digital elevation modelASTER GDEM modelelevation accuracy
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