Dissertation > Excellent graduate degree dissertation topics show

Research on Key Technologies of CityGML-Based 3D GIS

Author: XuJiaoLong
Tutor: JingNing
School: National University of Defense Science and Technology
Course: Information and Communication Engineering
Keywords: City Geography Markup Language 3D GIS 3D Visualization Spatial Data Management Spatial Analysis Pyramid Model
CLC: TP391.41
Type: Master's thesis
Year: 2010
Downloads: 143
Quote: 2
Read: Download Dissertation

Abstract


3D GIS is employed in an increasing number of applications. Compared to traditional 2D GIS, 3D GIS reflects the information of the real geographic environment better. It provides more friendly ways for interaction and has capabilities of analyzing 3D spatial information. 3D GIS is becoming the hot reaseach field of current GIS study and it has great potential in future application.However, the current development of 3D GIS is confronted with various issues and challenges. There is no mature model and unified framework for visualization while application departments use their own models and frameworks. It makes the interoperability and data sharing difficult. To solve these problems, Open GIS Consortium (OGC) has developed City Geography Markup Language (CityGML). It provides standard data model for 3D GIS. This thesis focuses on developing 3D GIS based on CityGML and several key technologies are studied. The main work of this dissertation can be conluded as following five parts:1. Thorough research has been made on visualization technologies of CityGML 3D models. A rapid parsing methodology combined with flow-based reading and data-binding is proposed. The multithread strategy is used to accelerate the data loading speed. To improve the performance of 3D rendering, geometry data are converted to direct3d mesh.2. To unify the management of CityGML data, this thesis studied the technologies of creating CityGML database on Oracle Spatial 11g. CityGML database is developed by simplifying CityGML model, derivating database schema and creating the import and export tool. To implement interoperability and data sharing in network environment, approaches for 3D GIS data publication are studied.3. To improve the rendering performance in client, the model for data organization is studied. Pyramid model is applied to the client buffer struct and efficient data dispatch algorithm is proposed.4. 3D GIS spatial analysis is also studied in this thesis. A rapid mouse picking method is proposed to obtain the terrain data under the 3D earth model and some measure functionalities such as distance, azimuth and area measuring are implemented.5. Finally, the design and implementation of CityGML-based 3D GIS prototype is discussed. The prototype implemented visualization, database management and network data publication, as well as the organization and dispatch of the client buffering data. It also can be employed to other applications as a fundamental platform.

Related Dissertations

  1. 3D Visualization Research of Medicial Ultrasound Image,TP391.41
  2. Lijiang River,RS and GIS - based Soil Erosion Research,S157
  3. GIS-based mine water disaster Geophysical Research Information Management System,TD745
  4. Three-dimensional Temperature Field Modeling and Visualization for Crystal Furnace,TP391.41
  5. Combination of multi-core based on the generalized Gaussian image classification method,TP391.41
  6. Three-dimensional spatial analysis techniques in the application of the digital channel,U612
  7. Study on Multi-source Spatial Data Integration Management for the Armed Forces of Gold,P208
  8. Study on the Engineering Properties of Loess and the Stability of Loess Slope Along a Railway,U212.22
  9. Study on New Mode of Community-based Influenza Surveillance in Tianjin,R511.7
  10. The 3D Visualization Study on Caijiaying Deposit (Ⅲ Orebelt) in Hebei Province,P618.51
  11. The Remote Sensing Monitoring and Assessment of Environment under the Influence of Mining,P237
  12. Emergency Geographic Database Design and Application in Geological Disaster,P208
  13. Based on GIS - Land Use Analysis System Design and Implementation,P208
  14. Based on the best choice of site area of GIS research,P208
  15. Based on MIS and GIS integration Kunming Tourism Geographic Information System,P208
  16. Spatial analysis Farmland Grading,P208
  17. Research on the Lettering Configuration and Expression in Virtual Geographic Environment,P283
  18. A Research on Pyramid Model Construction and Data Processing Technology of Terrain Data in Virtual Terrain Environment,P209
  19. The Research of Spatial Objects Integrated Visualization and System Implementation,P208
  20. Study on Spatial Layout Optimization of Urban Gas Station,F426.22
  21. On the Applied Research in the Forest Fireproofing System of the Geographic Information System,S762

CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Image recognition device
© 2012 www.DissertationTopic.Net  Mobile