| Real scene 3D model is a high-precision and strong current depiction of the real world.It is an important part of Digital China.The real scene 3D model of transportation facilities is the space-time data base for real-time visual interaction of intelligent transportation management.The cost,quality and efficiency of its fine creation restrict the development and application of intelligent transportation.The fine three-dimensional real scene model of transportation facilities can promote the development and application of intelligent transportation,improve the construction of smart city and promote the realization of Digital China.In order to overcome the problem that it is difficult to give consideration to the quality,fineness,efficiency and cost in the fine creation of the overall large framework and local small components in the real scene three-dimensional model of traffic facilities,and to solve the contradiction between the monomer demand and the high implementation cost in the model application,this paper proposes to integrate the tilt photography technology(real scene reverse modeling)and BIM Technology(high simulation real scene forward modeling)to explore a low-cost,high-efficiency Fine construction method of real scene three-dimensional model of high-quality transportation facilities.The refined construction of transportation facility model is divided into three steps.In the first step,based on the tilt photogrammetry technology,the consumer UAV is used to take the step-by-step surround aerial photography scheme,and the optimal parameter combination is applied to build the traffic infrastructure model,so as to realize the low-cost,high-quality and efficient creation of the real three-dimensional model of the spatial framework and large components in the traffic area.The second step is to digitally build the model of traffic ancillary facilities based on BIM Technology,solve the problem of batch,efficient and fine creation of 3D models of small components such as ancillary facilities,and automatically realize component monomer and attribute assignment.The third step is to realize the organic integration of the models in the first and second steps,and obtain a complete and fine three-dimensional model of the real scene of traffic facilities through automatic model fusion and matching.The development and application of intelligent transportation can be carried out based on the fine transportation facility model.The main research contents of this paper are as follows:(1)Reverse refinement based on tilt photography technology to create traffic infrastructure model.Using the theoretical analysis method to analyze and improve the traditional five sorties aerial photography form in the tilt modeling of consumer UAV,a comprehensive and efficient surround aerial photography form is obtained;The parameters of surround aerial photography are optimized by orthogonal test method,and the optimal parameter combination meeting the accuracy requirements of 1:500 model is obtained;Based on the analysis of the site with abrupt traffic and large height difference(suspension bridge),the stepped surround aerial photography scheme is designed,and the traffic infrastructure model of a certain section is created.However,this method is difficult to establish a fine model of small ancillary facilities(street lamps,street signs,etc.).(2)Based on BIM Technology,the model of traffic ancillary facilities is created digitally.Firstly,close range photography modeling is applied to collect the design data of ancillary facilities;Then use Revit to create auxiliary facilities family library;Finally,according to the coordinate data of ancillary facilities and their road centerline,through the secondary development software dynamo of Revit and the visual programming of Python script,the small components are created in digital batch and given the attributes of each monomer.Realize the perfect supplement to(1)establishing the model.(3)Automatic fusion and matching of transportation infrastructure model and ancillary facilities model.Firstly,the traffic infrastructure model is trimmed,then the coordinate system transformation and data export of the traffic ancillary facilities model(BIM model)are carried out,and finally the data of the two models are imported into the Super Map platform for fusion and matching to obtain a complete and fine traffic facilities model.The refined construction method of traffic facility model proposed in this paper adopts the consumer UAV to implement the reverse modeling of surrounding aerial photography based on the optimized aerial photography parameters,which has low cost,and the accuracy and efficiency are improved by 40% and 35% respectively;Using BIM Technology visual programming to realize digital high imitation real scene forward fine modeling,with high reuse rate;The traffic facility model meets the class I product requirements of the data product specification for three-dimensional geographic information model,and the auxiliary facilities are automatically integrated.This method has the advantages of low cost,high efficiency,good fineness and strong popularization.It provides an excellent scheme for the refinement of traffic facility model. |
