By the transformation theory of the adjustment, only the full rank transformation could get a full equivalent adjustment result to original observations.
按照平差变换理论，只有满秩变换，才能得到与原观测完全等价的平差结果。
2
With two types ofobservations, using Helmert variance component estimation, it can improve adjustment precision through multiple iterations.
并对两类观测值，利用赫尔默特方差分量估计，通过多次迭代计算，提高平差精度。
3
The practical applications of these methods are illustrated by taking triangulation adjustment and that of correlated observations in groups as examples.