Abstract: Oblique photogrammetry can perceive complex urban scenes with large scale and high-precision in a real-time and comprehensively. Furthermore, the technology obtains real facade texture while acquiring an orthograph, which guarantees the construction of three-dimensional models of urban scenes. This paper analyzes the necessary technology of urban three-dimensional monomer model measurement, and classifies the monomer model according to the types of urban elements by studing the fusion of two-dimensiona and three-dimensiona data. The fine monomer results have been applied in the construction of 665 km² urban three-dimensional model in Baiyun District, Guangzhou. It has been importantly used in the construction of the models, which not only improves work efficiency, but also reduces field labor intensity.

Key words: oblique photogrammetry, high-precision model of the city, monomer model, fine monomerization, model organization and classification