Abstract: With the continuous improvement of science and technology in recent years, urban 3D digitization has always been the key application direction of digital city construction.With the development of UAV remote sensing technology and 3D laser scanning technology, digital city construction has gradually turned to automation and intelligence.In this paper, Topcom Falcon 8 multi-rotor UAV combined with topcom GLS-2000L 3D laser scanner is used to collect data from buildings, and Context Capture automatic modeling and post-processing software is used to perfectly solve the technical problem of automatic 3D urban modeling, thus providing strong technical support for the construction of 3D system of smart city.

Key words: low altitude photogrammetry, 3D laser scanning measurement, Context Capture software