眾源GPS軌跡歸并算法研究
[Abstract]:With the rapid development and popularization of mobile Internet and mobile terminals, the reduction of smartphone prices has promoted the popularity of smart phones in most areas and people, and has become an indispensable tool in people's lives. The acquisition of GPS (Global Positioning System, global positioning system (GPS (Global Positioning System,) trajectory data by mobile phone becomes more and more convenient, and the scale is becoming larger and larger, so a large number of mobile object trajectory data appear. These locus data, however, produce a variety of location-based service (Location Based Services,LBS) applications. Therefore, how to automatically extract, construct and update the road network information from massive GPS track data has become a hot topic of current research. The solution of this problem lies in improving the urban traffic environment and vehicle navigation. Scenic area tourism and disaster relief and other aspects play a more and more important role. By using computer software, GIS (Geographic Information System or Geo-Information System, Geographic Information system (GIS) and considering the characteristics of vector data structure and raster data structure in spatial data structure, a multisource GPS locus merging algorithm is proposed in this paper. The algorithm includes four steps: vector data rasterization, raster data binarization, raster data vectorization and locus centerline extraction. Specifically, the track merging algorithm is implemented based on ArcGIS Engine component and C # language, then four groups of experiments are carried out, and four groups of experimental data are visualized and analyzed by Google Earth and ArcGIS Desktop software. Through the above analysis, the paper draws the following conclusions: (1) in the trajectory data preprocessing, Douglas Puck linear simplification (Douglas-Peucker,DP) algorithm is better for the removal of drift points; The noisy density-based clustering (Density-Based Spatial Clustering of Applications with Noise,DBSCAN) algorithm has good effect on noise point removal. (2) an optimized vector data rasterization method is used. Good results can be obtained by converting vector data into raster data. In the process of output merging, Gao Si filter algorithm can get good results by smoothing the trajectory. (3) the multi-source GPS trajectory merging algorithm proposed in this paper can accurately extract the track network and generate the central line.
【學位授予單位】:成都理工大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:P228.4
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