简言之，矢量数据利用最简单的拓扑实体—点、线和多边形，并在二维笛卡尔坐标系统中固定它们来描述地理特征。

In short, vector data take the simplest topological entities — points, lines, and polygons — and anchor them within a 2-d Cartesian coordinate system to describe geographical features.

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随着在不同的视图中作一点点调整和旋转，你应该能够很容易创建你的坐标系统。

With a bit of tweaking and rotating in different viewports you should be able to set-up your co-ordinate system easily.

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一种用点离基准线上(称极轴)固定点的距离和方向(角度)来表示点位置的坐标系统。

A system of coordinates in which a point is located by its distance and direction (Angle) from a fixed point on a reference line (called the polar axis).

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