Research On Symbolic 3D Route Scene Construction Method

In the 3D line scene,the dynamic segmentation technology can organize the multiple attributes and line elements effectively,but the existing data organization can not fully meet the multi-scale symbolic expression of the 3D line scene.The abstract 3D symbols can reflect the quantity and spatial distribution characteristics of the entity more intuitively than the 3D model,so it is especially important to design the 3D symbols and realize the symbolic 3D line scene expression.To address the above issues,this paper proposes a symbolic 3D line scene construction method that can highlight the key objects and can be efficiently organized.The method extends the dynamic segmentation technique and builds a dynamic segmentation pyramid model.Based on the dynamic segmentation pyramid model and 3D symbolic visual variables,a unified attribute mapping relationship is established to complete the multi-scale symbolic design of 3D line scenes.Secondly,based on the object importance evaluation model as the theoretical basis,the spatial importance is calculated according to the spatial characteristics of the geographical objects in the 3D line scene,and the object importance evaluation model is constructed by combining semantic factors.Based on the object importance evaluation results and City GML standard,the multi-scale design of 3D symbols is carried out.Finally,the symbolic 3D line scene is constructed for a railroad to verify the feasibility of the method.Among the main research contents and results are summarized as follows:(1)The 3D symbol design was combined with the line scene data organization method to complete the 3D line scene symbol design based on dynamic segmentation.For the problem of insufficient association between 3D symbol design and efficient line data organization methods,the dynamic segmentation 2D horizontal data organization is expanded,and the dynamic segmentation pyramid model is constructed,based on which 3D symbol visual variables and attributes mapping relationship is established for 3D symbol design,which broadens the design ideas of 3D line scene multi-scale symbols.(2)By calculating the object importance to highlight the expression of key objects,a symbolic 3D line scene dynamic expression method based on object importance is designed.For the problem of insufficient expression of the key objects of concern in the 3D line scene,the 3D line scene object space importance algorithm is improved,the object importance evaluation model is established,the 3D symbols are graded according to the evaluation model,the dynamic expression of the symbolic 3D line scene is realized,and the prominent expression of the important objects in the 3D line scene is satisfied.(3)A symbolic 3D railroad visualization system is designed and developed,which verifies that the method can realize the rapid construction and dynamic expression of symbolic 3D line scenes.