| WebGIS is a compatible, store, handling, analysis and display the geographical information of computer system in the Web environment. It is outcome of integration of Web technology with GIS technology, the basic starting point is to make use of the internet to issue the geographical information, and allow the customers browsing and gaining the data and function service of geographic information system by the browser.The traditional Web language is HTML, it is one kind of text display language, it has the congenital defect and deficiency to the information describing of spatial, it seriously affected the use of HTML to develop the advanced appliance ability base on Web. The HTML language of complex spatial data descriptions are only confined to the text, it has been helpless to the graph data. The HTML language cannot describe the spatial data with the complex mode, it have no way to achieve the sharing of data and mutually to operateThe W3C instituted the Scalable Vector Graphics-SVG describes the vector graphics based of XML format the text instruction, it is that W3C organization to adapt to the Internet at full speed to institute the scalable vector graphics language depiction to standardize, it can be satisfy GIS for display the spatial data graphical, it has good prospect in the WebGIS field, and it has brought new turning point to new turning point.To realize the WebGIS based on SVG Main thing is to converse another format geography into SVG document on the server. After the SVG document being announced, customer can view the WebGIS based on SVG on any point of the Internet.Based on the refer to the large number of domestic and foreign literature, ,Problem such as systematic concept, characteristic, system classification , system structural technology having discussed WebGIS systematically, the WebGIS map announces a technology face to face at present carrying out advantage and limitation comparing with to have analyzed , have discussed the different technology. Point out the current popular Web vector graphics resolving scheme SVG bringing the important effect into play in preparing a map each other under the control of indicating that preeminence waiting for aspect shows, WebGIS in the building played an important role.Right away, development of SVG, the characteristic introduce and analyses a thesis as well as the syntax rule has been in progress, the SVG relevance software has been in progress instruction for engaging in inner at present being popular for comparatively, the merit having set forth SVG, have analyzed the significance SVG is led into to WebGIS on the parallel basis being in progress to SVG and other form artwork.Hold the usage JavaScript script technology in the customer carrying out research and develop on SVG The server holds the prototype system having used C #, VB, AVENUE to be in progress coming into being and analyses to SVG, having developed a WebGIS. Be around. The first step has reached the geographical feature space data share and the interactive target under NET frame, has realized the feasibility using example to have verified what be brought forward a model owing to functions such as SVG data delamination display , attribute inquiry, on the technology.Make the WebGIS function, the maximum easy to use nature to have got very big rise, will promote development of WebGIS in applying SVG to WebGIS exploitation.
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