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。
This paper presents the first main field of digital image output: digital projection technology.
本文阐述了数字影像输出的第一大类领域：数字投影技术。
With respect to the third angle projection, this paper sets forth briefly its rationale, characteristics, and chart reading, in the form of comparison.
本文用对比形式扼要地阐述了第三角投影法的基本原理、特点和看图方法。
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