Research On The Information Retrieval System Of Typhoon Based On WebGIS

Typhoon is one of the most destructive disasters in nature. China is located in the area of Northwest Pacific Ocean, which has the most frequent occurrence of typhoon. Meanwhile, China is one of the most seriously disastrous countries suffering from typhoon. With the development of science and technology, the method for studying typhoon and acquiring data is improved, which leads to a dramatic increase in the data of typhoons. So we are eager to seek a better way to manage, analyze, retrieve and share the data.WebGIS is the union product of Internet and GIS. It not only has the functions of GIS, but also the characteristics of Internet. It is one of the tendencies of GIS. With the extensive applications of GIS in various fields, WebGIS becomes widespread. It proves WebGIS is a highly effective approach of data management and analysis. Therefore, WebGIS will provide a new method for data retrieval and sharing of typhoon. In the paper, I study how to utilize WebGIS to provide the service for information retrieval of typhoon.The development of Web technology requires the Web system having a higher performance. In the current Web2.0 framework, what is the tendency of WebGIS and how to unify Web2.0 and WebGIS to enable WebGIS to have a better interaction are the issues that will be discussed in the paper.After studying the characteristics and the applications of WebGIS in typhoon's field and analyzing the current Web system of typhoon, the paper discusses the tendency of WebGIS in the Web2.0 framework, analyzes the characteristics of ArcIMS, designs the information retrieval system of typhoon based on Web2.0 and ArcIMS, divides system into three levels of structure and designs the data structure and functions of system.In order to enhance the system's interaction and realize the separation of business logic and data view, the paper introduces Ajax which is the core technology of Web2.0 and Struts which is a framework of MVC. The characteristic of Ajax is the asynchronous transmission and partial refresh of data. The system uses Ajax to realize partial refresh and fetch data according to the users' needs, which contributes to theimprovement of the system's interaction and reducing the network transmission .The superiority of MVC pattern lies in realizing the separation of business logic and data view, increasing the reusability of code, which makes the system more flexible and easier to maintain and expand. Struts is a open source framework of Java that realizes MVC pattern. The system uses the Struts to realize the data inquiry, separates business logic and data view and increases the system's flexibility, which provides the good foundation for the system's maintenance and expansion.At the same time, the paper also studies how to display the typhoon's moving track, analyzes the characteristics of various kinds of traditional methods, and then uses ArcIMS Java Viewer to realize the display of typhoon's moving track based on layer.Finally, the writer summarizes and prospects the work that has been done in the paper. At present, the function of the information retrieval system of typhoon is still simple, so it will be an increase in the functions of the system in data inquiry, data analysis and spatial analysis in the later work.