Abstract
With the rapid development and steady advancement of Building Information Modeling (BIM) technology in China, traditional 2D Digital Line Graphic (DLG) data cannot visually display rich 3D spatial information, and it is difficult to meet the needs of BIM forward design. Aiming at the increasing demand for 3D spatial data in municipal project design, this paper proposes a forward design method based on oblique photogrammetry reality model. Firstly, the Quadric Error Metrics (QEM) algorithm is used to lighten the reality model. Secondly, the standard model library of municipal facilities is built in CATIA, and the lightweight reality model is integrated into CATIA for fine restoration. The refined reality model can provide BIM designers with reference to features, geomorphology, etc., avoiding unreasonable spatial planning, no external reference to model monomers, and missing model space location information. It is convenient for designers to design, display, compare and modify the scheme in the same platform to improve the efficiency of BIM design. Change the delivery form of traditional surveying and mapping data results, and encourage designers to use BIM technology for forward design from surveying and mapping, and accelerate the popularization and promotion of BIM technology in the whole life cycle of the construction industry.
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