The Architectural Design & Algorithm Realization For The Visualization System Of The MAGIS-WSP Platform

Researches in many aspects of the ocean have developed rapidly as it becomes increasingly important. Being the foundation of various researches, the marine and Geographic Information System (GIS) is particularly important. And the visualization model becomes the key part of marine GIS thanks to its intuitive and convenient display.Taking into account the characteristics of the marine and atmosphere data, this thesis has researched the visualization system of the Marine and Atmospheric Geographic Information System Web Services Platform (MAGIS-WSP), which involves the design and realization of the visualization system, seamless integration, and realization of algorithm ,etc. The main research contents are summarized as follows:1 the architectural design of the visualization systemThe realization pattern of the marine GIS has been improved with the development of software technology and marine data acquisition technology. After investigation and comparison of the advantages and disadvantages of various patterns, the thesis designs the active WebGIS framework, adopts the Web Servicess + ActiveX realization pattern, that is using Web Servicess technology under the SOA concept to realize the visualization thematic graphic services on the server, and using the technology of ActiveX on the client to satisfy the needs of users, like visualization, GIS graphic operation, etc.2 the algorithm realization for the visualization systemIt involves a dozen of algorithms in order to realize visualization functions and achieve better performances. And this thesis realizes several algorithms like the isoline, boundary cutting, memory mapping, etc. Given the slow trend characteristic of the marine data, it can not get an accurate graphic using the current isoline filling algorithm. To resolve this problem, a new area filling algorithm is proposed, which is based on regional topology and environmental gradient. Using this algorithm, it can achieve an accurate filling for the isoline map and make satisfactory results in the application. Through the researches in several aspects above, the thesis has completed the visualization system of the MAGIS-WSP, which has satisfied all the project demands. As the visualization system can be used to visualize most of the marine data and analysis results in an intuitive and convenient way, it has been applied in many fields such as the Ocean, Atmosphere and GIS.