本教程还假设您了解地图的一些关键特性：距离、坐标和比例尺。
The tutorial also assumes you know some key features of a map: distance, coordinates, and scale.
在GIS中，正确地设置坐标系统和图件的比例尺，是充分发挥系统功能，进行空间分析的前提。
In GIS, to set up coordinate system and scale correctly is a precondition that give full play to system's function and carry on space analyses.
本文叙述了用天文观测测定CCD片子上两坐标各自比例尺和两坐标轴不垂直度的方法；
In this article, the method is described for measuring the scales of the two coordinate axes of a CCD plate through astronomical observations and the nonperpendicularity of the axes.
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