A New Method of DEM Generation from Contour Line

This paper proposed a new method(HASM-OC) to construct DEM from contour lines based on the optimal control.Presently,HASM(high accuracy surface modeling) which is used to handle discrete points only.Firstly a regular grid points' are set up,on which each elevation will be predicted using the new method,each grid point represents the square grid area surrounding itself.Secondly,contour lines are used to construct contour trees,which are then used to get the bound constraints for each grid points.Finally,integrating the HASM equations,a numerical optimization problem is formed.By solving the optimization problem DEM can be secured,which is continuous and of high fidelity to original contours.A real contour lines example is given,and results from HASM-OC is compared with that from Hutchinson method based on TPS(thin plate spline),the former is superior to the latter in DEM construction from real contour lines.