The deliver and visualization of geospatial information in mobile GIS

With the development of mobile communications and wireless Internet technology, the mobile computing environment makes it possible to get any information from Internet at anytime and anywhere. However, client of mobile GIS has the diversity including cellular telephones, PDAs and vehicle terminals, etc. Therefore, mobile GIS must take this diversity into consideration and offer the service of spatial information running in various terminals. A standard open descriptive format of spatial information data is very important. scalable vector graphics (SVG), an effective approach in the era of mobile Internet, can get all sorts of bountiful graph information at anytime and anywhere. In mobile GIS system, SVG is also a valid method of representation spatial information. Mapping relation between spatial information and SVG marker was firstly studied in the paper. Secondly, method on generation of spatial information expressed by SVG was researched. Thirdly, the paper proposed SVG analysis and rendering approach combined pull mode with DOM view for render (DVR). Complex feature, such as water system of embedded island, was rendered by means of strategy of layer controlling. The experimental result shows that it is feasible to adopt SVG describing or representing spatial information. And SVG can solve the problem on the diversity of client during the mobile service of spatial information, which promotes to popularize the service of spatial information.