The Research On The Network's Transimission Of The Special Vector Subject For Forestry Which Is Based-on XML

With the great development and extensive application of Internet Technology, WWW is becoming an efficient way to publish information, and provides a new and effective media for delivery and publishing of geographic information. It is a focus that the research of map web publishing. But map web publishing is facing to new challenges for further development, which can solve the opening problem about map web publishing. As a new web technology, XML bring new opportunity for web map publishing.This text is guided by GIS technology, it has the main body of a book mutually with space information share, multisource space information integration, XML space data-based interactive and the relevance. So it can express SVG with XML standard-based network artwork.SVG (Scalable Vector Graphics, shrinking in the vector artwork) is the second interactive language XML (Extensible Markup Language, May expand mark language)based on the Internet which is the opening outside world artwork to describe that language. SVG is able to satisfy the demand of Web developer to develop some demonds of the vector artwork shrinking,readjusting oneself to a certain extent and having nothing to do with platform completely, it is the most effective way to solve the network bandwidth which is not worthing at present gravely, but to the geonomy workers it has given the space data a maximum facilitate about announcing,exchanges and expresses.This text has taking forestry knowledges as the basis (forestry is the important branch about the long survival of a human being and its development. Because the forestry bears the 21 centuries'improvement of the ecological environment and promotes significant society economy sustained development mission of China, we cannot look upon forestry as estate or cause simplely,also it cannot be considered as a branch of agriculture only. Otherwise we must fix position from strategy of sustainable development altitude again to forestry, and according to the target of the social development to define forestry, otherwise we cannot know the important of forestry).Take the special forestry subject as the main object of study, it also takes the technology of studying the special subject for forestry based on SVG as directions.This paper analyzes the difficulties and problems of the special subject for forestry publishing technique. Then this paper puts great emphasis on the application of the new web technique in the field of geographic information, and studies deeply on the XML-based map web publishing technique, then puts forward the display scheme adopting to come to hold a map as the customer SVG. Lastly this paper puts forward the SVG-based display project of map at web client, so it would solve the problems about multi-display and inter-operation of map at web client.The model of XML-based map web publishing and the visualization of map data based on SVG are put forward in this paper have many significations to the map web publishing technology. In the end of this article it has pointed out the defects that will exist in the special subject and some approaches to be improved, and at the same time it looks into the distance the application of the technology based on the SVG network map.