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The design and development of complex 2D symbol library system based on GIS system is completed by combining design pattern technology. Firstly, it states that the design of the symbol library system has its unique difficulties. The diversity and complexity of symbol library lead to difficulties in the design of symbol. Secondly, using the abstraction to implement the classification and generalization of symbol objects. Using and Improving the classic composite pattern to extend the diversity of symbols with the method of combining primitive symbols. Combining factory method and template method pattern to reduce the coupling between modules and improve the extendibility of the system. Finally, the design of the system is very good to achieve the 2D symbol library’s function under GIS. It’s integrated in the existing GIS system well. It’s powerful, reusable and good extendibility. Keywords-design pattern; GIS system; 2D symbol library; primitive symbol

Application of Design Patterns in Development of Reusable GIS Symbol Library