求翻译：手工测绘一般常用正投影方法。正投影方法主要是当投射线与投影面为垂直的平面线时，成为正投影。在正投影图中，物体的某一面与投影面平行时，投影图形可以反映出物体该面的真实形状和尺寸。正投影法具有实行性、积聚性、相似性的特性，能十分方便的反应物体的真实性。是什么意思？

Manual surveying and mapping commonly used orthographic projection method. Orthographic projection methods become orthographic projection line with the projection plane is the plane perpendicular to line. Orthographic diagram, one side of the object and the projection plane parallel to the projectio

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Manual mapping general commonly used normal projection method.The normal projection method mainly is works as when projecting line and projecting plane for vertical even facial suture, becomes the normal projection.When orthograph, object some at the same time with projecting plane parallel, the pro

Manual of surveying and mapping common orthographic projection methods. Orthographic projection methods are mainly when the line and projective plane of projection is perpendicular to the plane when the orthographic projection. In orthographic projection diagram, when one side of the object parallel

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