Research On The Application Of High Precision Realistic Modeling Method Based On BIM Technology

With the further promotion of China’s new construction industrialization,the high-precision live-view modeling technology of BIM technology in the field of transportation engineering is rapidly improving.The real-world modeling technology integrates non-contact mapping,computer graphics and BIM technology into one,which makes the high-precision real-world modeling increasingly used in various disciplines and industries.In this thesis,we will take the high-precision realistic modeling method as the research object,analyze the influence of the combination of different flight control parameters,and analyze the error of different devices for the influence of the parameters.To further improve the accuracy of the real-world model analyzed the TIN pyramid construction principle,combined with a lightweight real-world model to create a BIM display platform,the main conclusions of this paper are as follows.(1)The uniform experimental design of the flight control parameters(heading overlap,side overlap,altitude of flight,camera angle)makes the method of UAV image data acquisition further optimized,so as to find the law of universal image acquisition.To address the effect of pixel error,a mathematical model is fitted using multivariate least squares method.(2)An aerial survey common joint edge processing method is proposed,which enables further fusion of image data acquired by different devices and effectively addresses the wide range of applications of economical UAVs and non-measurement cameras.Two splicing methods are proposed for cameras with different size sensors to improve the control of the common splicing accuracy.(3)Within the accuracy range allowed,a two air triangulation strategy is proposed,using the control points in the overlapping area to first construct the scale space subject image and then the local detail image according to the spatial features,eliminating the influence of the exposure point close to the baseline too short.Through the secondary air three strategy and 10 check points and 4 control points deployment,the model ground image resolution reaches 1.4cm/pix,and the research results can complete the real-world refinement inverse modeling with high efficiency and accuracy.(4)Using multi-source data fusion to further improve the spatial three-dimensional matching effect of the images,thus completing the establishment of a high-precision realistic model of Nanzhou Bridge.On this basis,the BIM technology is used to lighten the realistic model of Nanzhou Bridge,and the BIM display platform is developed using WebGL technology to lighten and display the realistic model of Nanzhou Bridge.