The Design And Implementation Of Vehicle Continuous Panoramic Roaming System

Panorama is also known as 3D pratigue,is a kind of new media technology.While the car will be a panoramic view of its location and the traditional map of the combination of street map.It extends the traditional 2D map to 3D visualization map.These provide users with an immersive experience,Google,Baidu and Tencent have launched their own street map service.On the basis of vehicle continuous panoramic acquisition platform developed independently by our school,this paper carrys research on the key technology of panoramic roaming and designs the index and storage node of the panoramic image navigation chain based on map navigation.It links the road nodes with the road,the road and the image points and the adjacent roads through the spatial topological relation,which provides the data base for the connection between the electronic map and the panoramic image.It creates a highly efficient and reliable vehicle continuous panorama roaming 3D visualization scene,and develops a vehicle continuous panoramic roaming system(hereinafter referred to as "system").The system supports multi-user concurrent access,offline browsing and other operations,and provides a panoramic image hot spot labeling,mobile phone upload self timer panorama function,which enrich the user experience.The system uses the ArcSDE spatial data engine to release the panoramic image navigation chain(locus)into ArcGIS Service map service.Among them,the server uses the Spring_MyBatis as the panoramic roaming server framework,and uses Ehcache as the cache framework to improve the scheduling efficiency of the client on the cached data.The client uses Html and CSS to provide interface design and style design and creates 3D scene based on the WebGL Three.js as the 3D engine to achieve continuous visual rendering of the vehicle.The data transfer between client and server is based on the asynchronous request of Ajax,which can realize the refresh of local cache panoramic image data of panoramic roaming system.The system takes the image data of 32 kilometers in Beijing,Dongcheng District,as example,furthermore,in the mainstream browser(such as Google,Firefox,IE)test performance is stable and reliable: Map matching and panorama,upper and lower frame panoramic load without Caton,360 degree panoramic roaming show smooth.This will lay a good foundation for the next step of measurement and other functions in this system.