Research On Visualization Technology Of 3D Real Scene Based On Cesium

In recent years,with the development of unmanned aerial vehicles(UAV),it is a reality to use UAV to acquire geographic information data instead of the previous manual operation mode.On the other hand,with the maturity of the automatic modeling technology,it is possib le to carry out the rapid 3D modeling.In the era of mobile Internet,how to render 3D models on different kinds of terminals has become an important issue in recent years.At present,there is no more mature overall solution at home and abroad.Cesium is the most advanced open source 3D GIS framework,can directly displayed a three-dimensional virtual earth on the browser page and superimpose a wealth of geographic elements on it.Research on visualization technology of 3D real scene based on Cesium.Major work of this thesis is as follows:1.A method of Cesium real 3D model generation based on aerial image is proposed.Design a process from the aerial to generate Cesium three-dimensional data,and propose solutions to common problems.The effectiveness of the proposed method is verified by the engineering practice of the UAV aerial photography,Smart3 D automatic modeling and data format conversion.2.A field clipping algorithm based on the relationship between surface and point is proposed.This algorthm solve the problem of elements visibility judgment in the Cesium scene,Can remove the invisible elements removed scene,reduce the Cesium rendering workload,reduce the workload of the browser.3.A scheduling algorithm for 3D real scene data based on mult i-tree is proposed.It can greatly reduce the network bandwidth occupied by the 3D model data transmission,improve the rendering speed,and realize the smooth render of the 3D real model between different levels.4.A module of 3D real scene model visualization based on Cesium is designed and implemented.This module,using the B/S architecture,without the need to install any plug-in,can perfectly render three-dimensional real scence model generated by UAV oblique photography.After testing,the design of the module is stable and efficient,can be compatible with a variety of operating systems and hardware terminals.The visualization technology of real scence based on Cesium is very advanced,has high market application value and broad development prospect.