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.
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.
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).
点和其他几何助手，比如像轴、坐标系统等也进行了模型化处理。
Points and other geometric helpers like axes, coordinate systems etc. are also modeled.
点和其他几何助手，比如像轴、坐标系统等也进行了模型化处理。
Points and other geometric helpers like axes, coordinate systems etc. are also modeled.
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