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Road and Bridge 3D Model Reconstruction and GIS application
3D Model building
The three-dimensional urban spatial information system, or the simulated digital city based on the Internet three-dimensional geographic information system, contains rich spatial information, which can fully describe or display the appearance of the urban three-dimensional construction. Through spatial information to carry out full-view planning, Query and decision. However, the current three-dimensional structure is more important than the 3D models of buildings and underground pipelines. The road construction bridges are mostly not three-dimensional, mainly because the combination of buildings is relatively simple, and the bridges are mostly non-rectangular and the coordinates must be linear and vertical. Slope and super high settings. This article is to study the systematic and rapid modeling method of three-dimensional model of road and bridge in AutoCAD. Then use 3D roads and bridges to transfer 3D to GIS system and discuss the application of 3D model in GIS system. Use EXCEL as the relevant design data to build a platform to calculate the external structure dimensions and coordinate elevation of each part of the bridge, and use the secondary development software AutoCAD VBA as the development interface, write a program to convert the point data of each part of the structure calculated by Excel into an exhibition Painted as a 3D model, saving repeated operation time. Introduction and drawing of each structure, and the resulting 3D model is further applied to the geographic information platform. By calculating the three-dimensional vertex coordinates and elevations of components of roads and bridges designed by design, the components of roads and bridges are combined into a three-dimensional model of bridges with geodetic coordinates and drainage slopes using a program, which can be used as a pre-construction loft Check the coordinates and elevation, and cooperate with the landscape of the platform to judge the rationality of the location, check whether there is conflict between the various structures, and integrate the time information of the construction phases of the project to carry out information integration and analysis for actual and planning Perform the comparison of the drop to verify the feasibility and practical benefits of the roadwork 3D model imported into 4D construction simulation.
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