A Comparative Study of the Applied Methods for Estimating Deflection of the Vertical in Terrestrial Geodetic Measurements
Journal
Date Issued
2016
Author(s)
•
Tini, Maria
•
•
Serantoni, Eugenio
•
Borghi, Alessandra
•
•
Guillaume, Sébastien
Abstract
This paper compares three different methods capable of estimating the deflection of the
vertical (DoV): one is based on the joint use of high precision spirit leveling and Global Navigation
Satellite Systems (GNSS), a second uses astro-geodetic measurements and the third gravimetric geoid
models. The working data sets refer to the geodetic International Terrestrial Reference Frame (ITRF)
co-location sites of Medicina (Northern, Italy) and Noto (Sicily), these latter being excellent test beds
for our investigations. The measurements were planned and realized to estimate the DoV with a
level of precision comparable to the angular accuracy achievable in high precision network measured
by modern high-end total stations. The three methods are in excellent agreement, with an operational
supremacy of the astro-geodetic method, being faster and more precise than the others. The method
that combines leveling and GNSS has slightly larger standard deviations; although well within the
1 arcsec level, which was assumed as threshold. Finally, the geoid model based method, whose
2.5 arcsec standard deviations exceed this threshold, is also statistically consistent with the others
and should be used to determine the DoV components where local ad hoc measurements are lacking.
Volume
16
Issue
4
Start page
565
Issn Identifier
1424-8220
Rights
open.access
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