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就工程控制网而言，由于其边长较短（一般在2公里左右），有时为了工作快捷采用多个组同时作业或受地形条件的限制须采用偏心观测，据现行有关文献对测站偏心元素的测定精度要求势必给外业工作带来一定的困难。另外，当边长较短且偏心距较大时，推算控制网各边近似边长的误差相应增大，从而会导致在求取测站归心改正数时出现较大的残余误差，为解决这个问题，本文提出了循环求解归心改正数的方法，并针对实际情况就偏心元素的测定精度要求作了一定的探讨。
In terms of engineering control network, due to its short side length (usually about 2 km), sometimes in order to work quickly using multiple groups at the same time or by the terrain conditions must be eccentric observation, according to the current literature on the eccentric station The accuracy of the element determination is bound to bring certain difficulties to the field work. In addition, when the side length is short and the eccentricity is large, the error of the approximate side length of each side of the control network increases correspondingly, which leads to a larger residual error when calculating the centering correction number of the station. In order to solve this problem Problem, this paper proposes a method to solve the centroid correction cycle by cycle, and makes some discussions on the accuracy requirements of eccentric elements according to the actual situation.