在形变资料处理过程中,现在广泛采用秩亏自由网平差。众所周知,这一平差方法是以图形的重心作为参照基准,因而成功地消除了误差传递。然而,唯其如此,又产生了新问题,即重心偏离所带来的误差。平差图形的参照重心是用误差方程中未知数的近似值来确定的。对形变网进行平差时,通常是按照惯用方法,取第一期成果作为以后各期相应未知数的近似值。在一个形变区域 In the process of deformation data processing, we now widely use rank deficit free network adjustment. As we all know, this adjustment method is based on the center of gravity of the graph as a reference, thus successfully eliminating the error transfer. However, this is the only problem that has created new problems, namely, the error caused by the deviation of the center of gravity. The center of gravity of the adjustment graph is determined by the approximation of the unknown in the error equation. When adjusting the deformation network, it is common practice to take the first period of results as an approximation of the corresponding unknowns in subsequent periods. In a deformed area