Elzbieta Jasinska, Edward Preweda
Effect the Accuracy of Benchmarks to Establish of the Determination of Geodetic Network
Conference Information: 
9th International Conference “Environmental Engineering”, 22–23 May 2014, Vilnius, LITHUANIA 
Source: 
ICEE2014  International Conference on Environmental
Engineering 
Book Series: 
International Conference on Environmental Engineering
(ICEE) Selected papers 
ISSN: 
eISSN 20297092 online 
ISBN: 
eISBN 9786094576409 
ISBN: 
ISBN 9786094576904 CD 
Year: 
2014 
Publisher: 
Vilnius Gediminas Technical University Press Technika 
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Abstract
In classical applications of parametric method
to compensate the coordinates of geodetic networks
is usually assumed to establish faultless points.
The object of estimation parameters, the coordinates
of points are determined by observations which mediate
appointment of unknowns. References points can have
larger standard deviations than the accuracy of observations.
This is the results of the advances in technology. If it is
necessary to obtain the coordinates of the height accuracy freely
alignment is often used, taking for example the coordinates of one
point and the azimuth direction of the flat networks or the level
of only one point from network leveling. This simplified solution
is justified when it is important to get internal network precision
because we get rid of the errors in this way to benchmark point.
This is not the exact solution.
In the case of having the knowledge of variancecovariance matrix of benchmark points,
it should be reflected in calculation. In the case of benchmarks, which amount
was set many years ago, generally covariance are not known. In this case, alignment
it is still possible, it can be based on the variance, which can be determined,
for example, on the altitude network class. Benchmark points are considered
establish in this case as the observations and unknowns simultaneously. They
shall be the subject to appointment and are treated as pseudoobservations.
This article is an example of comparison between network adjustment which included
level marks standard deviation and the other one freely alignment and assumptions
inerrancy establish points. Convenient extension of the of parametric method was
proposed, where the notion of observation equations for the point (coordinate) was interposed.
Keywords: Benchmarks; Geodetic Network; freely alignment.
