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空间数据符号化是GIS中数据可视化的重要手段,是目前GIS实现过程中计算机时间开销最大的工作之一。提高空间数据符号化效率,是提高GIS软件性能的重要方面,本文提出考虑全局优化、面向符号对象整体、基于特征元的算法设计思想。据此提出一种基于特征元的符号库的数据结构及实现算法。实验表明,运用该算法及相关数据结构的空间数据符号化软件不仅效率优于传统算法,而且扩展了符号库法实现空间数据符号化的功能。 更多还原

【Abstract】 Spatial data symbolization is an important method for GIS data visualization. It involves the most computer work in GIS processing. Therefore, to promote the efficiency of spatial data symbolization is vital for enhancing the capability of GIS software. This paper has proposed an algorithm design based on property unit, taking into account the global optimization and symbol object orientation. A property-based data structure and algorithm is also proposed. Application results show that it not on... 更多还原