本文根据线状要素地理信息表达的需要，对线状符号进行了分类，在分析了线状符号的视觉变量之后，给出了其图案单元的数据结构。
The linear symbol is classified according to the demand for symbol expressing, besides the data-structure of pattern cell of linear symbols is given combining with its visual variable.
本文根据线状要素地理信息表达的需要，对线状符号进行了分类，在分析了线状符号的视觉变量之后，给出了其图案单元的数据结构。
The linear symbol is classified according to the demand for symbol expressing, besides the data-structure of pattern cell of linear symbols is given combining with its visual variable.
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