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A plane alignment technology research based on Google Earth data source

Author: JiangXiaoJun
Tutor: SongZhanFeng
School: Central South University
Course: Road and Railway Engineering
Keywords: Highway route designing Google Earth Plane optimization Genetic Algorithms
CLC: U412.32
Type: Master's thesis
Year: 2011
Downloads: 100
Quote: 2
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Abstract


Highway route design in the pre-feasibility stage of road construction, sometimes due to the lack of information on the terrain of the line selection led to the difficulties of the stage line selection. To this end, it is necessary to propose a new method to select, use the Google Earth Digital Earth technology to solve the problem of terrain data acquisition circuit design. The same time, in order to reduce the workload of the designer and to improve the automation of line selection of highway route designing the plane automatically optimize the alignment in-depth analysis, relevant content and achievement are as follows: (1) to Google Earth Digital Earth application status at home and abroad, using Google Earth Digital Earth as a highway route design platform, and describes the system design goals of the platform, workflow, and the necessary computer technology. (2) the use of the Google Earth COM API quick access to the area of ??the line selection terrain data from Google Earth, and Google Earth download the data and engineering measured data accuracy compared statistical analysis, obtained Google Earth topographical data accuracy to meet the road line selection in the pre-feasibility stage of terrain data accuracy requirements conclusion. In addition, download data coordinate transformation and the mixed surface modeling processing, the establishment of a digital terrain model based on Google Earth terrain data. Experiments show that the digital terrain model video graphics display with the Google Earth platform to match, with relatively high precision. (3) the establishment of a planar linear optimization model. Simplified optimization process can be performed more quickly, the detailed form of highway construction cost objective function, a simple form of the objective function as the fitness function of the genetic algorithm. Optimization process is divided into two phases: the first phase does not consider the plane constraints, the use of the plane coordinate plane chain line polyline points as design variables; second stage is to consider the plane constraints, the initial graphic design line the intersection of plane coordinates and radius of circular curve as design variables. (4) use GAlib library technology, based on the established digital terrain model and the plane linear optimization mathematical model to optimize the alignment in the area of ??line selection. Will ultimately optimize linear with both linear and data were analyzed, the experiments show that optimized line earth more balanced cut and fill, and without considering the bridges and tunnels and other facilities, optimize line than the existing line earthwork Province.

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CLC: > Transportation > Road transport > Road works > Planning, surveying and design > Circuit design > Selection design
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