The Angle between a linear feature and a horizontal line in a vertical plane containing both lines.
一个直立的平面内介于一线性特征与一条水平线之间的角度。
PROJECTION that preserves the Angle measure between any two lines.
保持任意两条线问夹角的度量不变的射影。
Screen Angle: the Angle between the direction of lines or dot elements and the horizontal.
网角：黑子元素或网线方向与地平线所造成的角度。
Screen Angle: the Angle between the direction of lines or dot elements and the horizontal.
网角：黑子元素或网线方向与地平线所造成的角度。
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