模型驱动的土地调查要素符号库设计与实现

Design and Implementation of Vector Symbol for Land Investigation Based on Model-driven

土地调查的工作性质与目的会产生多种需求,除去存储工作中海量的成果数据,还需提高数据的组织、利用效率,如准确的数据表达、节省数据存储空间、优化数据检索速度等。针对这种需求,本文结合实际生产需要,研究基于矢量数据库的符号化表达机制,研发符合土地调查数据制图标准的符号化机制和实现方法。按照土地调查数据制图的相关标准,提取规定的符号图元与参数,使用矢量图元的方式制作要素符号,实现土地数据要素符号的标准化,形成完整的土地调查要素符号库。设计并研发通用符号库访问接口,为不同的制图软件使用符号库提供途径,实现符号共享与符号库的跨平台应用。

There will be variety of demands generated by the specification and purpose of land survey.In addition to the massive result data in the storage work,the organization and utilization efficiency of data should also be improved.For example,expressing the data accurately,saving data storage space,optimizing the speed of data retrieval and so on.According to these demands,in this paper,we studied the symbolic expression mechanism based on vector database combined with the actual production needs,and developed the whole vector symbolization mechanism and realization method in accordance with the land survey data mapping standard.According to the land survey data mapping related standards,the specified symbol graphic elements and parameters are extracted,and the symbols of land data elements are made by means of vector graphic elements,so as to realize the standardization of symbols of land data elements and form a complete symbol library of land survey elements.The universal symbol library access interface was designed and developed to provide a way for different cartography software to use symbol library and realize symbol sharing and cross-platform application of symbol library.