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Research for GIS Map Symbol Lib Exchange Format
Figure 4. XML schema structure view of line symbol
XML schema structure view of Area symbol is show as figure 5. It is consisted of border, color of background, point-symbol of fill, line-symbol of fill. The border is one of borderless (without border), border line(type, width, color) and index of line symbol. The point symbol fill is consisted of type of point symbol(index of point symbol or name of image file), arrange mode(1:Triangle 2:Square), x space and y space. The line symbol fill is consisted of index of line symbol, rotary angle and space.
Figure 5. XML schema structure view of area symbol
5 Conclusions
To implement exchange format of symbol library, it needs cooperation of user, GIS manufacturers and standard organizations. It also needs to consider implementation method and data structure of various GIS platforms. The exchange format XML schema introduced in this paper is only a first draft, still a lot of works needs to do, but the authors believe that it is possible to share symbol information between different GIS platforms by exchange format. It may be a rout to translate symbol library data in different GIS platform by exchange format just like exchange spatial data in different GIS platforms.
Reference
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