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在施工测量中用三方向前方交会定点中产生的示误三角形，通常用近似图解平差方法来确定点位。本文提出了严密平差图解方法来确定点位，它的精度比用近似方法高，而且计算亦很简单．一切计算工作均可在施工测量前进行． 本文还对各种近似方法与严密方法进行了比较，最后讨论了点位精度计算方法．
In the construction survey with three directions to the front of the intersection of fixed point generated in the error triangle, usually by approximate graphic adjustment method to determine the point. This paper presents a rigorous adjustment method to determine the location of points, its accuracy than using approximate method is high, and the calculation is also very simple. All calculations can be carried out before the construction survey. This article also compares various methods of approximation with rigorous methods, and finally discusses the method of calculating the precision of points.