Digital Elevation Modeling refers to creating a 3D representation of the elevation of a terrain. It realizes a visualization of a point data set that contains x, y and z coordinates of a surface. DEMs represent longitude, latitude and height information from the real-world that can be visualized using 3D mapping software. There exist many variations of DEMs. DTMs are also known as bare-earth DEMs that do not include objects, such as trees or buildings. A DSM is a DEM that does include such objects and represents the highest locations on the landscape.