Investigation and Analysis of the Precision Criteria in Free and Fixed Levelling Networks.

Document Type : Research Studies

Author

Public Works Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.

Abstract

In the last few years. the use of free levelling networks in the different engineering  constructions has been increased It was clear that comparing the results of the free  levelling networks with the fixed levelling networks. having the same configurations and  the same measurement technologies, yielded unexpected smaller numerical values of common precision criteria than those of the fixed levelling network .  
The aim of this research is to study the reasons for this phenomena by interpreting and  illustrating the variation In the geometrical meanings for precision criteria of both free  and fixed levelling networks  New criteria suitable to describe the precisions in both cases have been obtained. Hence,  it is possib le to make a correct comparison between them. A practical levelling network  has been used as a practical sample example using different variables in adjustment  processes for this study  

Main Subjects

MEJ- Mansoura Engineering Journal
Volume 21, Issue 3
VOL 21 has two issues issue 2 consist of two parts from (September to December)
September 1996
Pages 1-12

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