Study Of Multi-scale Matching Method Between Solid Model And Terrain Taking Into Account Linear Features

With the booming trend of geographic information service,3D visualization technology is widely used in many fields such as city informatization,engineering monitoring,road network management and park management.At the same time,a huge amount of geographic information spatial data comes along,and its data accuracy gradually improves and its scale grows.At present,how to accurately and efficiently match between 3D models and terrain models in linear3 D scenes is one of the important research aspects in 3D visualization.On the one hand,the bottom surface of the artificial model is often horizontal,while the terrain model is an undulating irregular triangular mesh,leading to gaps in the matching between the artificial model and the terrain,and the matching accuracy and efficiency between them need to be further improved;on the other hand,linear engineering construction is mostly carried out using multiple spatial right-angle coordinate systems,while the matching scheme between the corresponding 3D model and the terrain is lacking in the 3D scene.In this study,to solve the above two problems,the research proposes a multi-scale matching method of solid model and terrain considering linear features,and the application practice is carried out in the linear 3D scene visualization management system to realize the accurate matching of model and terrain under different matching scenes,and the main research contents and research results are as follows.(1)A review of the status of research at domestic and international level.The significance of this paper is elaborated in terms of the practical problems and application requirements in model-terrain matching research.At the same time,the current research status of 3D model,linear 3D model and terrain matching is summarized and summarized,and the problems and shortcomings in the current research of solid model and terrain matching are discussed.The ideas of scene complexity classification and linear coordinate segmentation are proposed,which set the research direction and research ideas for the development of this study.(2)An overview of the multi-source heterogeneous 3D model data and its multi-scale representation strategy,as well as the integrated representation strategy for 2D and 3D data is presented.The scene complexity assessment factor is introduced,and the scene complexity classification is carried out by constructing a scene complexity assessment model,so as to realize the model matching scheme considering the scene complexity.Point and surface 3D models are matched with terrain according to the scene complexity classification results.(3)The characteristics of linear 3D scenes are outlined from three aspects: the geometric nature of linear 3D scenes,the influence of projection deformation of linear engineering,and the strategy of integrated representation of linear 3D scenes.A linear 3D scene model matching scheme is designed.Taking the linear engineering independent coordinate segmentation accuracy requirement as the constraint,the linear 3D model is segmented and loaded with 3D scene,and combined with the local terrain correction technology,the accurate matching of the ultra-long linear 3D model and the terrain is realized.(4)Application of linear 3D scene model matching.The method of this paper is applied in a linear 3D visualization platform for practice,and the results are verified for accuracy and comparative analysis,and have been applied to real projects now.