旧有曲线的改建,我国大都采用角图法,角图法的主要优点是外业测量简单,可将复杂曲线化为简单图形,便于全面考虑曲线改造。现在的外业测量工作,根据我们实践工作中体会,速度慢,又要测角度,又要测矢矩,而且矢矩尺难于放准垂直于照准线位置,影响了f值准确性,用这种方法取得的外业资料,计算旧有曲线角图面积,也很烦琐,影响內业计算速度。我局提出一种改进方法,测量简单,只测每点的角度,不必測矢矩,每一鏡观测的点数较多,这就减少了转鏡次数,加快测量速度。內业计算也可以简化,同时也适用于同向曲线、反向曲线及复曲线等复杂曲线的校正。这种测量方法,已经在我局工务大修设计中推广 Reconstruction of the old curve, most of our use of the map method, the main advantage of the map method is the field measurement is simple, can be complex curves into simple graphics, to facilitate the full consideration of the curve transformation. Now the field measurement work, according to our practice experience, slow, but also to measure angle, but also to measure moment, and vector moment is difficult to put vertical perpendicular to the position of sight, affecting the accuracy of f value, with This method of obtaining information on the field, calculate the area of ​​the old curve corner map, but also very cumbersome, affecting the calculation speed of the industry. Our bureau proposed an improved method. The measurement is simple. Only the angle of each point is measured. There is no need to measure the moment. There are many points for each mirror, which reduces the number of rotating mirrors and speeds up the measurement. Intra-industry calculations can also be simplified, but also for the same curve, reverse curve and complex curves and other complex curve correction. This measurement method has been promoted in our office overhaul design