Research On Urban Mapping Method Of Mobile Measurement System

Urban basic surveying and mapping is a preliminary,basic and public welfare work related to the development of national economy and society.It is the spatial basic framework and important infrastructure of "digital city".With the improvement of the update period and data present situation,urban basic surveying and mapping put forward higher requirements for data acquisition.Aerial close range photogrammetry has gradually become the mainstream technical means of urban basic surveying and mapping at home and abroad.However,due to the influence of many factors,some cities have more strict airspace application restrictions and can not use aerial photogrammetry for a long time and a large area,so we need to find another way to solve this problem.Mobile measurement technology integrates slam + IMU + GNSS,which can quickly obtain point cloud,photo,video and other information,and obtain rich vector data from point cloud,so as to quickly update topographic map and rich attribute information,and provide a new technical hand for basic data collection of Urban Surveying and mapping.In this paper,the application of mobile measurement system in urban mapping is evaluated and compared,mapping method research and optimization,combined with typical engineering applications,the paper explores the mapping process based on mobile measurement systems,and provides reference for the use of new technologies for urban basic mapping.The main research results of this paper are as follows:(1)The comprehensive evaluation method of mobile measurement system in urban mapping is designed and developed,and the mainstream mobile measurement system is comprehensively analyzed and evaluated in terms of accuracy,efficiency,applicability,etc.(2)Aiming at the problem that the traditional mapping system can not meet the requirements of point cloud mapping,the paper studies the method of point cloud mapping in depth,develops a set of mapping method which is more suitable for mobile measurement system,the secondary development of the existing mapping system problems and customization optimization,researched the graphic short code expression,layer management,primitive code management and other methods,developed point cloud cutting display,batch processing and other functional modules,simplifying the drawing process and improving the efficiency of point cloud drawing.(3)In the typical engineering production application of Tongzhou core area,according to the technical standards of urban mapping and the actual production scenario,a complete and detailed production standardization process is summarized to guide the follow-up production work.(4)Try to apply the point cloud achievements of the mobile measurement system to more products,provide more abundant data sources for later extended applications,and explore more applications of the mobile measurement system in the field of Urban Surveying and mapping.