Road Parameterization Fine Modeling Based On Vehicle Laser Point Cloud

Three dimensional modeling is a key technology to express real world 3D entities or objects in mathematical world.With the development of information technology,people pay more and more attention to the surrounding environment.The expression map of the plane can no longer satisfy people's needs,so the importance of 3D model construction is increasingly reflected.New data sources such as laser point cloud and oblique photography provide more detailed data for 3D modeling.In view of the new fine data and fine 3D reconstruction,if the traditional modeling method is used,the workload is large,the efficiency is low and the precision needs can not be met.Therefore,this paper studies the reconstruction method of the fine parameterized model based on the fine data obtained by the laser point cloud.The main research work in this paper is as follows:(1)Establish the data structure of road 3D model.According to the pattern and form of the road environment,the model data are classified.Based on the classification rules,the road environment objects such as road trees and street lamps are parameterized.Then,according to the characteristics of the road objects and the topological relations between each model,the reasonable data structure of the automatic model building is designed.(2)In view of the problems existing in the three-dimensional re-construction of road surface and marking line,a method of quadrangle modeling for pavement continuous plane is proposed,which realizes automatic rapid reconstruction of bend and slope pavement,solves the problem of adaptive texture mapping of pavement texture,and uses the method of feature projection of model node to reconstruct the road marking line,and solves the hand.The problem of repetitive projection in modeling.(3)The characteristics of irregular distribution and large quantity are analyzed.The two fork surface modeling method is designed,which avoids the problem that the number of model data is too large because of the number of surface models.The modeling method of road lamp instantiation based on position and orientation is proposed,which realizes the automatic adjustment of the position and position of the street lamp,and solves the repeated work of manual adjustment in artificial modeling.(4)For the linear structure models such as kerbs and flower beds,a model building method based on linear lofting technology is proposed,and the automatic adjustment of edge cutting angles is realized.By automatically defining parameters,different types of linear models can be quickly generated.