A Digital Elevation Model (DEM) is an image, with the information about the elevation of the terrain in meter above sea level saved in every of its pixel. You can download DEM in different resolutions from several sources in the internet
The Area Physical Framework or APF is a land zonation tool for strategic land planning and land management
APF Poster & Primer – EXPORT
APF is a Land Governance Tool for local authorities. It provides an overview and guide for the use and allocation of land resources based on policy determined by the area landscape characteristics.