Distributed Network Dedicated Geographic Information System Design And Implementation

Geographical Information System is the subject that reflect current situation and trendency of living space ,depend on which people make a living ,that descripe the characters,function as input ,output ,show,preservation of spatial datas and query ,synthetical analysis ,adjuvant decision-making.With the development of net technology ,putting forward conception that digital earth .traditional WebGIS is evolving in the direction of distributing .WebGIS is the integration of WebGIS and net,which make the application of WebGIS expand to all of the aspects ,become into popular info tools.The article will study and discuss the WebGIS in the distributing environment according to customer's need for WebGIS.The content was divided into three parts.In the first part of the paper,what it mainly explicate is data characters and managical mechanism.and what is the advantage in contrast to single version and client/server version.In the second part of the paper, what it maily discuss is that some modes by which WebGIS can be realized.namely,the mode that based on the server-side themode that based on client-sidethe mode that mix the server-side with client-side. The last ,the same time ,It is the most important part of the paper—the mode that is the mixture of the former .namely—distributing WebGIS.At this part,we combine the instance for police of geographical information system with the theory we discuss the aboved. and make the further study for distributing WebGIS system.after .set up related system.The main production the paper had yielded is that,according as the criterion and standard for politically geographical information system,took advantage of technology of computer and WebGIS,establish unite electrical atlas database,that make the platform ,Which realize share and exchange of information ,come true. Based on compesitive geographically informational platform,put the visual query of polical information into practice,that on the basis of spatial electrical atlas,so as to improve integrated capability,such as superintend and decision-making,quick response,counter-terror and so on , offer effective ways for safty-management,deployment of polical strength,distributing of cop and blah blah blah that related to polical business.