| Work presented is one part of the preject" Chinese Lithosphere Three-Dimensional Structure Database ", sponsored by the Ministry of Land and Natural Resources (200010101). Final achievement of thesis is to set up a WebGIS environment and to publish all collected data on Internet involved in six subsidiary database including 18 layers of Chinese Lithosphere Three-Dimensional Database to realize the sharing of information and data among local even users of whole world. The clients can query and simplely analyze these data only by common viewers.As a new GIS developing direction, WebGIS can make GIS popularize, no more a expertise masterd by experts in some domains. ESRI Company is regarded as the industry standard of GIS software, Its WebGIS product, ArcIMS, has strong extension, and this kind of extension does not receive any restriction. The thesis mainly focuses on issue of 18 layers data of Chinese Lithosphere Three-Dimensional Database six subsidiary database on Internet. So the customers can realize GIS operation to these data with the ordinary customer end browser. The main aim of the thesis is how to utilize the powerful graphics programing and the opening, cheapness, operation simplicity, multimedia, supported super connection ability of Internet to develop a website with multiple functions and friend interfaces. Through analysing Chinese Lithosphere Three-Dimensional Database information service system and common used software and hardware conditions, considering the advantage and disadvantage of online GIS and the complicated magnanimity data, such as the spatial and attribute database and the systematic extension in the future, Client/Broker /Server architecture was to be adopted to design the system.The ArcIMS4.0.1 of ESRI Company was adopted to be the backstage supporter software and the HTML, webpage making language, JavaScript, programming language and ArcXML, mark language communicating with ArcIMS server to design client interface with basic GIS function. The requests like GET_IMAGE , GET _ FEATURES were used to design advanced GIS functions. Server end operating system is Windows 2000 and Web server is Microsoft IIS 5.The system designed in the thesis is a popular product developed based on ArcIMS, it faces to the masses network users who access this system through Internet to inquire relevant information about Chinese Lithosphere Three-Dimensional Structure Database. For users usually are not GIS or certain field experts, The functions must be easily understood. The system is a map inquiry, and simple geographical information system which has realized the geographical functions of the general desktop information system. The difference between them is that to apply to Internet to embed them in webpage and to support the user's inquiry in the same time. The system characteristic is lower demand to the operating system and the same as to the hardware of the client. It can normal be run on Windows series system and web viewers IE 4.01 or higher. The response speed is very quick generally the refered requests will return the results to the users within 2-3 seconds. Regarding of the system, for the client end that faces to users and the client end is the webpage in Web browser, the interface design is only to design webpage. When build this interface, the frame technology in webpages was used to divide the mian webpages of website into six districts to make relevant information be concentrated on a page to users. These six districts are: Title board area which shows website's name, etc, Content Table area: Show data layer in website in form of the tree, well arranged, easy to operate. Map viewing area which shows the map image data returning in each request including a overview area, Toolbar area which classifies tools of website by function, help those to operate datum who do not familiar with GIS. Text tip area which tip users the active layer and tool selected by use at present, function area which is used for carrying on the communication with ArcIMS Servlet connector respectively. |
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