3D mapping integrates LiDAR, GNSS/INS Positioning and Positioning System (POS), camera and storage control unit, combining forestry survey, topographic mapping, smart city, power inspection, emergency survey disaster and other mapping application needs, with real-time 3D modeling and offline 3D modeling, can be carried on a variety of multi-rotor UAV flight platform and handheld devices, rapid, mass collection of high-precision point cloud data and rich image information, widely used in mapping, electric power, forestry, agriculture, land planning, geological disasters, mine safety and other fields of 3D spatial information acquisition. LiDAR able to obtain the 3D spatial information point cloud data of the target object quickly, accurately and in large quantities, and recover the 3D model of the building by pre-processing, feature extraction and matching, and incremental stitching of the point cloud data. 3D mapping gives a very realistic view of the environment, enhancing the visualization. 3D mapping has numerous applications in engineering, research, and survey fields. Its application can also be found in preparing high-quality Digital Elevation Models (DEM) around the globe. Using LiDAR with 3D mapping is reliable, accurate, and cost-efficient.