关键词: 道路工程, Web3D, 档案管理, 三维模型简化, 误差度量

Abstract: Road engineering Web3D archives management is important to improve decision-making ability. The key technologies including scene organization and management, integrated building and simplification method for road 3D model are studied. An organization and management method based on directed acyclic graph is proposed. Child nodes are derived gradually in depth by subdivision. Brother nodes are divided by mileage-section or sense type in breadth. Standard model nodes are shared by related father nodes. Based on constrained Delaunay triangulation, the road 3D integrated model is created. An error metric for 3D model simplification considering road constrained edges is put forward, in which, the geometric error for every edge and an additional error for constrained edge are included. The constrained edges can be refined preferentially. Benefit from above methods a road engineering Web3D archives management system is developed out, in which, road 3D model quickly view-dependent reconstruction is realized and constrained edges are retained on the client. This system has been applied to many highways construction and operating management.

Key words: road engineering, Web 3D, archives management；3D model simplification, error metric