Digital Elevation Model An ordered array of numbers that represents the spatial distribution of elevations above some arbitrary datum in the landscape(eg. sea level) Elevations sampled at discrete points over a specified segment of the landscape Three data networks. 1. Triangulated irregular networks 2. Contour-based networks 3 Grid-basedDigital Elevation Model: • An ordered array of numbers that represents the spatial distribution of elevations above some arbitrary datum in the landscape (eg. sea level) • Elevations sampled at discrete points over a specified segment of the landscape Three data networks: 1. Triangulated irregular networks 2. Contour-based networks 3. Grid-based