The traditional method of measuring the terrain by hand is time-consuming and you have to go back and remeasure the details immediately if you find a measurement error. Nowadays, we only need to use drones or other equipment to obtain 2D images and data about terrain, then use tools such as 3Dsurvey for image processing to locate the model, generate dense 3D point clouds from aerial images, so as to analyze each geographical location and design the model easily.

Quick Terrain Modeler (QT modeler for short) is a professional three-dimensional point cloud processing and terrain visualization software. It is mainly suitable for fast processing of large-scale LiDAR or dense point cloud data set acquired by other laser devices, also has functions of browsing, editing and analyzing these point cloud data.