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Bulletin géodésique

, Volume 54, Issue 2, pp 235–245 | Cite as

Roundoff accumulation at weak horizontal positions

  • Dennis G. Milbert
Article

Abstract

This paper examines computer roundoff error accumulation in the least-squares adjustment of horizontal geodetic networks containing positions of very poor geometry. Roundoff error accumulates at the weak unknowns but does not disturb the solution of well-determined positions. Numerical results are given.

Keywords

Normal Matrix Roundoff Error National Geodetic Survey Normal Equation System Horizontal Network 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. George E. FORSYTHE, Michael A. MALCOLM, and Cleve B. MOLER, 1977:Computer Methods for Mathematical Computations. Prentice-Hall, Inc., Englewood Cliffs, N. J., 259 p.Google Scholar
  2. Curtis F. GERALD, 1978:Applied Numerical Analysis, Second Edition. Addison-Wesley Publishing Co., Reading, Mass., 560 p.Google Scholar
  3. Peter MEISSL, 1979: A priori estimation of roundoff errors during the direct solution of a super-large geodetic normal equation system.NOAA Professional Paper, National Oceanic and Atmospheric Administration, U.S. Department of Commerce, Rockville, Md. 20852 (In press).Google Scholar
  4. Charles SCHWARZ, 1974–1975: Adjustment computations (lecture notes), Department of Geography and Regional Science, George Washington University, Washington, D.C.Google Scholar

Copyright information

© Bureau Central de L’Association Internationale de Géodésie 1980

Authors and Affiliations

  • Dennis G. Milbert
    • 1
  1. 1.National Geodetic Survey National Ocean SurveyNOAARockville

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