ABSTRACT
Digital elevation models (DEMs) are representations of terrain elevation as a function of geographical location (Raaflaub and Collins, 2006), and are typically represented in one of the two formats: contour maps where the surface is represented by lines of constant elevation at even intervals or point heights where the surface elevation is sampled on either regular or irregular grids. In this chapter, the method of HASM (Yue et al., 2007) is combined with optimal control theory to make the accuracy of DEM as high as possible.
