FAST RECONSTRUCTION OF THREE DIMENSIONAL CITY MODEL BASED ON AIRBORNE LIDAR

摘要

Three Dimensional City Model (3DCM) research becomes a hot area in GIS field in recent years. The 3DCM research also has great significance in traffic, land, mine, surveying and mapping, and other fields, especially in urban plan. The difficulty of acquiring 3D data is the key hamper for the development of 3DCM. Airborne LIDAR, which integrates GPS, INS and scanning laser rangefinder, can rapidly acquire the 3D position of ground using airplane. It is very economical, efficient and convenient to acquire 3D data. Traditional three-dimensional data acquisition method can't satisfied with the more and more fast development need of the city. airborne LIDAR technology is regarded as a convenience, swift, high-efficient three-dimensional data acquisition method, widely admitted progressively. LIDAR technology already has a history of more than ten years, major problem of hardware technology and system integration has already solved, had already developed successfully many business soft systems. But postprocessing technology of LIDAR data still lag behind after practice, among them, the key problem is the data classification and extraction. A lot of commercial companies and some large institute are devoted to the research of this respect in the world, many kinds of filtration algorithm and extraction method have been introduced. in the future, more effective and more perfect algorithm will been used. Because of the complexity of the topography and surface feature of the objective world, at present, the research on data classification and extraction lay particular emphasis on different applications. As regards modeling of three-dimensional city, study mainly concentrate on the topography extraction and the building extraction etc. This paper has introduce post-processing procedure of airborne LIDAR data systematically, has realized the fast reconstruction of three-dimension urban model based on LIDAR data, enable this technology to serve the information construction of the city better.