A 3D model is a product from a large number of images captured using aerial photography. In order to generate three-dimensional model, think of the images as the number of pixels each image stores. These pixels act as points. When you think of an image this way, the number of points that could be made up from 200 images is quite large. These points can be transformed into three-dimensional space using the principle of photogrammetry, which is the process of turning multiple 2D images into 3D. The points in three-dimensional space are referred to as a point cloud, which is made up of thousands to trillions of points. From a point cloud, measurements such as distances, angles, surface areas and volumes can be accurately calculated.