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www.sea-technology.com December 2014 / st 21 For submarine pipelines, the design of existing geo- graphic information visualization systems is limited to 2D mapping and literal display, which cannot directly display the data with the practical terrain. Most GIS systems cannot let the user observe and cannot provide enough freedom of operation. Here, we describe a system that adopts coor- dinate transformation and 3D visualization technology and is based on the Unity 3D game engine and a Web service. 3D Modeling of Submarine Terrain Before we designed the information visualization system for submarine pipelines, we built models for the submarine terrain. We used synthetic aperture radar and GPS, as well as Unity 3D to model the topography and geomorphology W ith the gradually increasing shortage of land- based oil, minerals and other strategic resourc- es, countries all over the world are looking more and more to ocean resource exploitation, including oil and gas. For instance, in the past 10 years, China has increased its new sources of oil to about 1.931 bil- lion tons, with 53 percent coming from the ocean. The development of ocean petroleum exploitation technology has led to large-scale submarine pipe- lines, which come with security risks. Submarine pipeline monitoring requires obtaining submarine terrain data, shallow profle data, location of the pipeline and other relevant data to correctly evaluate the risk, enable oil and gas transmission, enable con- trol measures, decrease accident risk, and reduce harm to the ocean environment. Currently, computer graphics and virtual reality technology are combined with GIS software, Web services and 3D modeling to dynamically display geographic data. For instance, Hoover J.H., Sut- ton P.C. et al designed an analysis and evaluation system of visualized groundwater contamination in rural communities based on Internet GIS that makes a multilayer information display map for users to operate according to terrain and geographic data. But this system can only display the prescriptive region in 2D. In another example, Xiaolin L., Linnan Y. et al proposed a soil fertility information management system based on embedded GIS. Although this system can display soil fertil- ity data on smartphones, PDAs and other mobile terminals through the SQL database and Web service, the limitation of the release carrier is large and the portability poor. Once the system is released, it's diffcult to modify software layers. Wan-Mohamad W.N.S. and Abdul-Ghani A.N. proposed a geotechnical data processing and presentation method based on GIS that can process and display geographic and geotechnical data by using collected data, a district map and Esri's (Redlands, California) ArcGIS software. This meth- od depends on ArcGIS, so its portability is poor. This method also emphasizes theoretical analysis, and the geographical elements are displayed roughly. Information Visualization System For Submarine Pipelines Design Based on Space Coordinate Transformation and Web Service By Xiongfei Zhi • Xiushui Ma • Genlang Chen Overall display scheme of pipeline information data.