projection of scan line 扫描线投影
Gerardus Mercator's projection, published in 1569, was immediately useful because it depicts a line of constant bearing as a straight line, which is handy for Marine navigation.
福西厄斯•墨卡托的投影于1569年问世,马上就派上了用场,因为它把不变的方位描绘为直线,这对航海非常方便。
Trend is the direction of the horizontal projection of a line, measured clockwise from north.
线倾向:它是直线水平投影的方向,自正北顺时针度量。
Draw the projection of the intersection line.
在相交处应画出交线的投影。
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