The Research Of Terrestrial Laser Scanning Technology

The technology about spatial data collection was a hot topic in geo-spatial information fields. Its very difficulty to describe the objects with complexity and diversity in our world with conventional data collection instruments .Its not a dream to describe the objects in our real life by computer with its speedy development. The innovation and improvement of technology promote the data obtained means directed in integration, real time, dynamic, digitalized and intelligent steps. Three dimension terrestrial laser scanning technology is a new data collection means in this circumstance. Terrestrial laser scanner system have found application to many measurement tasks such as engineering projects and cultural recording because of their high resolution ,high efficiency, accurate and rapid point cloud capabilities. This technology has become increasingly perfect in the last decade. Some people called the terrestrial laser scanning technology a new revolution after the emergence of global position system in geodesy and geomatic fields.At first, this paper introduced the basic principle of terrestrial laser scanning technology systematically and classified the multiple terrestrial laser scanners at the same time. The system collected point clouds included error was analyzed and the error propagation rule was found in succession, meanwhile the sole point position precision was given. Subsequently, the point clouds processing arithmetic such as point identification, edge and corner feature extraction, scanning block matching and joining, surface model reconstruction and data structure was expatiated in detail respectively.Finally, the fusion of terrestrial laser scanning data and image data processing model put forward and the work flow was given. The real scanning test was implemented and real objects surface model was reconstructed in AutoCAD platform based on VBA language. The structure line was extracted and the length was compared with total station data. The results demonstrated the superiority of terrestrial laser scanning technology and some constructive advices and conclusion were given.