Hello Alexander!

But now other problem: how them to use for the analysis of reliability of geodetic networks?

I think, there are a lot of great textbooks, which answered your questions, e.g. Charles D. Ghilani, Paul R. Wolf: Adjustment Computations - Spatial Data Analysis. I also believe, that a textbook, which is written in your native language, would be more helpful to answer your questions than I can do...

kind regards
Micha

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applied-geodesy.org - OpenSource Least-Squares Adjustment Software for Geodetic Sciences