...洲的 deltaic 三角测量 triangulation ;triangulation operations ;trigonometric survey ;trigonometric surveying 三角测量外业组 triangulation field squard ..
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When surveying major diameter and higher hanging pipeline, common trigonometric leveling can't meet precision requirement, but tangent method surveying can meet precision requirement.
在悬空管线测量中，对于管径大、悬空高的管线，用普通三角高程法测量很难满足精度要求，而用切线法测量则很容易达到精度要求。
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