DEM Error Surface Realization Based on Conditional Simulation

In order to overcome the limitations of RMSEs,we developed a scheme for DEM error surface construction based on conditional simulation(CS).A DEM error surface of Dongzhi tableland locate in Gansu province were comparatively constructed based on CS and ordinary Kriging(OK).Results indicate that OK has an obvious smooth effect,whereas CS can accurately represent the spatial fluctuation of DEM errors.DEM error has a more serious effect on slope accuracy in flat area than that in complex area;Results of water and soil loss level determination show that about 70.2% of grids are influenced by DEM errors.