平面投影 planar projection; plane projection; projection on a plane 平面投影法 plane projection method ..
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projection on a vertical plane 垂直面上的投影图
Maps (on paper or on the screen) are flat surfaces; they require a transformation from the curved surface of the earth to the flat plane: a map projection.
纸上或屏幕上的地图是平面的；它们需要从地球的曲面向平面进行转换：地图投影。
Map projection in cartography is a way to present a two-dimensional curved surface on a plane, such as a normal map. Figure 2 shows a Traverse Mercator projection.
绘图法中的地图投影方法可以在平面中表示一个两维的曲面，例如一个标准地图。
Thee students asked:can we make a projection line to the Equator line on a plane?
同学们又问了：我们可以在这个切面上做一个到赤道线的垂线吗？
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