Research of Accuracy Verification of Digital Map 50m Grid (Elevation) Using First Order Triangulation Station Data

Abstract

Digital Map 50m Grid (Elevation) provided by Geographical Survey Institute (GSI) is very useful for users to prepare the data set suitable for their purposes. However, the altitude accuracy is verified only in the limited narrow region. This research estimates the accuracies of the 50m DEM data set using 965 triangulation points in the entire Japan. It is found that the mean range of altitude is 6.2m, the standard deviation is 6.2m and the root mean square error is 8.8m.