Research On Data Model And Method Of Symbolic Sharing Of GIS And Graphic System Map

Map symbols are the map language. They are also the basic tool for portray geographic information. We can cognize the geospatial evironment arround us through them. Thus, map symbols are the important components of maps and GIS. However, they are difficult to share between platforms because of the differences of symbol structures and models. Graphic systems are the softwares or standards for drawing vector grapihcs, such as CorelDraw, Illustrator, SVG, etc. They are often used to design maps in the field of surveying and mapping and many map symbols are graphics in them. But these map symbols can not be shared to GIS and GIS symbols can also not be shared to graphic systems. A lot of map symbols are made duplicate ly in the process of designing and publishing maps and the efficiency for map production is often low.This paper mainly focuses on map symbols sharing between GIS and graphic systems. Symbol models between them will be analyzed. A data structure and several methods for symbol sharing will also be proposed. Firstly, graphic compositions, organization styles, data structures and storage styles will be analyzed between GIS and graphic systems. Secondly, a symbol model which based on PB symbol model for sharing map symbols between different platforms will be designed. Geometry structures and fill styles in the orgin model will be extended. Thirdly, aim at sharing problems from graphic systems to GIS. Point, line and fill symbols sharing methods and custom output methods for graphic systems will be discussed. Through them map symbols in graphic systems can be shared to GIS combining with the method for GIS sharing PB+ map symbols. Fourthly, methods for symbol conversion from PB+ map symbols to graphic systems will be presented. Symbol symbolization and sharing methods for graphic systems will also be disigned. Therefore, GIS symbols can be shared to graphic systems combining with the method for PB+ symbols sharing GIS symbols. Finally, a prototype system for map symbols sharing between GIS and graphic systems will be created based on symbol sharing model and methods. Symbols sharing modules for graphic systems will also be realized. They also validate the feasibility and applicability for map symbols sharing through the symbol data of topographic maps and forest maps.