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Journal of Geodetic Science

Editor-in-Chief: Eshagh, Mehdi

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Online
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2081-9943
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On The Errors-In-Variables Model With Singular Dispersion Matrices

B. Schaffrin
  • Geodetic Science Program, School of Earth Sciences, The Ohio State University, Columbus, Ohio, U. S. A.
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ K. Snow
  • Corresponding author
  • Geodetic Science Program, School of Earth Sciences, The Ohio State University, Columbus, Ohio, U. S. A
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/ F. Neitzel
Published Online: 2014-03-17 | DOI: https://doi.org/10.2478/jogs-2014-0004

Abstract

While the Errors-In-Variables (EIV) Model has been treated as a special case of the nonlinear Gauss- Helmert Model (GHM) for more than a century, it was only in 1980 that Golub and Van Loan showed how the Total Least-Squares (TLS) solution can be obtained from a certain minimum eigenvalue problem, assuming a particular relationship between the diagonal dispersion matrices for the observations involved in both the data vector and the data matrix. More general, but always nonsingular, dispersion matrices to generate the “properly weighted” TLS solution were only recently introduced by Schaffrin and Wieser, Fang, and Mahboub, among others. Here, the case of singular dispersion matrices is investigated, and algorithms are presented under a rank condition that indicates the existence of a unique TLS solution, thereby adding a new method to the existing literature on TLS adjustment. In contrast to more general “measurement error models,” the restriction to the EIV-Model still allows the derivation of (nonlinear) closed formulas for the weighted TLS solution. The practicality will be evidenced by an example from geodetic science, namely the over-determined similarity transformation between different coordinate estimates for a set of identical points.

Keywords: Errors-In-Variables; singular dispersion matrices; Total Least-Squares

References

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About the article

Published Online: 2014-03-17

Published in Print: 2014-04-01


Citation Information: Journal of Geodetic Science, Volume 4, Issue 1, ISSN (Online) 2081-9943, DOI: https://doi.org/10.2478/jogs-2014-0004.

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© by K. Snow . This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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