Abstract: With the continuous progress and evolution of technology, handheld 3D laser scanners, as efficient and high-precision surveying and mapping instruments, have received widespread attention and application in various industries in recent years. In response to the shortcomings of traditional instruments used for facade measurement during the renovation of old buildings in urban renewal, such as low efficiency, difficulty in drawing complex buildings, and inability to guarantee accuracy, this article explores the technical characteristics and parameters of handheld 3D laser scanners. It focuses on introducing the technical process and application case studies of facade measurement for the renovation of old buildings in urban renewal. Finally, it looks forward to the application prospects of handheld 3D laser scanners, which is of great significance for improving the technical level of facade measurement for the renovation of old buildings in urban renewal.

Key words: handheld 3D laser scanner, building elevation measurement, laser point cloud, data acquisition, accuracy