Design And Implementation Of 3D Park Management System Based On Cesium

As an important application pillar of smart city,the park undertakes the typical de monstration task of smart city construction.The comprehensive perception of multi-di mensional data sources in the park management also promotes the demand for the con struction of three-dimensional geographic information system in the park.At the same time,with the rapid development of UAV tilt measurement technology and automated modeling technology,massive 3D data at the park level can be quickly collected and produced,which is widely used in 3D geographic information system with the support of 3D visualization technology.However,due to the complex texture and material of the inclined 3D data in the p ark,the huge amount of data leads to the low efficiency of loading on the visualization platform,and even the phenomenon of stagnation and crash always occurs in the load ing process.At the same time,the inclined model generated by automatic modeling is a whole irregular triangle network,which can only be limited to browsing,and it is im possible to select and query the attributes of the ground objects separately.It is not con ducive to the fine management of the park and limits the application of skewed data in the 3D visualization system of the park.Therefore,in order to solve the appeal problem,this thesis builds a Cesium-based3 D park management system and focuses on the loading optimization of 3D tile data and the monomer method based on the tilt model.The main work of this thesis is as fo llows:(1)The data specification and structural characteristics of 3D Tiles supported by Cesium are studied,and the OSGB data of the campus is converted to 3D Tiles by usin g the automatic modeling technology of oblique photography and the data conversion technology of Cesium Lab.Aiming at the loading optimization of 3D tile data,this thes is proposed a loading scheduling strategy algorithm based on octree,which included t he optimization method of visualization technology and 3D tile data structure.Experi mental results show that the optimization method can improve the loading efficiency o f 3D tile while ensuring visual effect.(2)The monosomy method based on tilt model is studied,and a dynamic monoso my method based on spatial query is proposed in view of the shortcomings of the curr ent monosomy method in the application of campus GIS.The front and back end coop erated to complete the monomer bounding box based on primitive rendering,and reali zed the dynamic monomer of buildings in the park.Experimental results show that the proposed method is feasible and flexible for the monomer realization of the tilted thre e-dimensional model at the park level.(3)Taking Longgang New Town Economic Development Zone as a test park,a 3D park management system based on Cesium was designed and implemented.The sys tem not only realizes smooth loading of 3D tile data and dynamic spatial query monoli thic,but also realizes functional modules such as user login,visualization managemen t,plotting management,information query and spatial analysis.The system has high a pplication value in the 3D visualization management of the park.