With the development and populariza

With the development and popularization of computer technology and the wide application of Matrix Algebra, optimization theory and probability statistics in surveying adjustment, it has a profound influence on surveying adjustment theory, it is the surveying adjustment from the classical adjustment theory to the modern adjustment theory, which promotes the development of the surveying adjustment theory knowledge, expands the mathematical model of the classical adjustment theory, and puts forward some new methods for the data processing of the modern adjustment, such as correlation adjustment, rank-defect adjustment, posterior estimation of stochastic model, biased estimation, etc