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Research And Implementation On Key Technologies Of 2D And 3D Integrating Display In WebGIS

Posted on:2018-12-10Degree:MasterType:Thesis
Country:ChinaCandidate:W K ZongFull Text:PDF
GTID:2310330521450028Subject:Engineering
Abstract/Summary:PDF Full Text Request
Geographic Information System(GIS)is an computer information system that integrates functions such as collecting,processing,analyzing,storing and displaying geographic information data.The GIS client architecture includes both C/S architecture and B/S architecture.Because the GIS client based on the B/S architecture is implement in the browser.,so it is easier to use and has a better performance in compatibility.But the current B/S architecture GIS client are take 2D map as the main research objectives,this is very limited in the processing and display 3D spatial information data,and can not meet the user's demands.If we can integrate 2D and 3D maps into the same GIS,and display 2D and 3D map side by side in browser to achieve map linkage data synchronization,the users can observe and process geographic information data through two dimensions at the same time.Therefore,in order to make full use of the advantages of B / S architecture and improve its shortcomings,this paper presents a concept,that integration of 2D and 3D in WebGIS,and studies the 2D and 3D WebGIS display technology based on B / S architecture.The research work of this paper mainly includes:1.Studies the WebGIS visualization technology and graphics rendering technology,explains the source code of Cesium and Open Layers3 in detail,analyzes how the map class library realizes the function of displaying and processing the geographic information data,lay the foundation of realization for the integration of 2D and 3D.2.In combination with the above research,through the integration of the underlying data,the interface encapsulation and the expansion of the function between Cesium and Open Layers3,accomplish linkage of 2D and 3D map,synchronizedthe the display,update and analysis results of geographic data.Seamless combination with web services,achieve the goal of the integration of 2D and 3D in WebGIS.3.Based on the integration work in WebGIS,this paper designed the functions of the measurement,the place names service,the map grid and so on,meet the basic needs of users.This paper build a complete WebGIS with the function displaying and processing of geographic information.4.After the design and implementation work of WebGIS,this paper carried out the system optimization work.We have compressed and combined static files to reduces the number of HTTP requests and the volume of requested data,used the HTTP header to achieve the browser cache strategy.Enhance the user experience when they waiting for the page to load.The WebGIS designs and implements in this paper,is based on the cross-platform characteristics of Web technology and the map open source libraries.This system is combined with the display of geomorphological data and the display of 3D geospatial terrain data,and synchronous geographic information between the 2D map and 3D map.This system is rich in features,easy for users to use,completed the project's intended goals.After the delivery of the system,the performance is stable,reliable,in line with user requirements,play a key role in practical engineering practice.
Keywords/Search Tags:Integration of 2D and 3D, Cesium, OpenLayers3, WebGIS
PDF Full Text Request
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