Based On 3D Laser Feature Extraction And High Precision Map Making

As the demand for smart cities continues to deepen and enrich,the development of smart transportation has also been paid attention to more and more people However,in order to obtain further development in the field of smart transportation,high-precision maps have become an inevitable and important research work.The high-precision map is a high-precision database which integrates city building information,city road information and other component information into hierarchical,three-dimensional coordinate information and facilitates to attribute classification extraction.The integrated management of urban traffic information through the use of a database makes it easier to control and plan the overall city and traffic.Based on the research of the extraction and production of high-precision elements based on the vehicle-mounted mobile 3D laser system,this paper combines the advantages of the vehicle-mounted mobile 3D laser system to obtain the laser point cloud data and image data of road elements quickly,efficiently and with high precision.The key points and difficulties that may be encountered in the extraction of elements and the production of high-precision maps are analyzed.The main research work is as follows:(1)This paper mainly introduces the research on the principle of three-dimensional laser ranging and angle measurement by reviewing the development history of three-dimensional laser.However,the development of three-dimensional laser technology also promotes the expansion of three-dimensional laser equipment from a single mode to handheld-type,Stand type,backpack-type,vehicular-type,airborne-type and other modes.Combined with the specific requirements of high-precision maps,vehicular and airborne 3D laser scanning systems are the best choice.This paper uses the vehicle-mounted mobile measurement system to make high-precision maps,which leads to the issue of coordinate system and coordinate conversion.Therefore,this paper also makes an in-depth analysis of the selection of coordinate system and the principle of coordinate conversion.The above principles provide theoretical support for mobile measurement systems and high-precision map production,and lay a theoretical foundation for the study of this paper;(2)Based on the specific requirements of a high-precision map of a section of highway in a certain city,this article first selects the mobile measurement system of "Zhonghaida" as the data acquisition method,and then develops the main steps of the experimental process:survey analysis,acquisition route planning,control the processes of point collection,verification point layout,field data acquisition,data sorting and preprocessing,accuracy verification and quality evaluation,feature extraction and high-precision map generation.In this paper,by processing and analyzing the collected data and comparing the accuracy verification points,it is concluded that the hardware equipment selected in this experiment meets the requirements of the highway high-precision map production.At the same time,the equipment selected in this experiment has high efficiency in field collection and has important economic value for the production of high-precision maps.(3)According to the analysis experiment,the key point of making high-precision maps is how to collect road information comprehensively and accurately.In addition,the difficulty of high-precision map production is how to extract the acquired road elements quickly,accurately,and automatically,so as to obtain the desired high-precision map.Combined with the hardware equipment selected in this experiment and the map element extraction algorithm,the problems encountered in the experiment are highly resolved,and it has important guiding significance for the actual production of high-precision maps.