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An investigation of the criteria used to select the polynomial models employed in local GNSS/leveling geoid determination studies

  • E. Tusat
  • F. Mikailsoy
Original Paper
  • 53 Downloads

Abstract

Ellipsoidal heights are determined with high accuracy using Global Navigation Satellite System (GNSS) techniques. In infrastructure projects undertaken for engineering purposes, orthometric heights are used. Geoid determination studies based on these two height systems are growing in importance. Although various methods are employed in geoid determination, one of the most commonly used in practice is local geoid determination. Points with known orthometric and ellipsoidal heights are used as reference points. These reference points are utilized to determine local geoid models for project area. The formation and selection of the most appropriate and true-to-reality model during modeling are a matter of extreme significance for practitioners who employ such models. In this study, we aim to establish a GNSS/leveling geoid in a test network that was formed in Konya for the purpose of local geoid determination. Validity tests are carried out for five different geoid models. These geoid models are determined using polynomial models of up to the third degree, and an exploration of the parameters that could be used in the decision-making process is performed. In accordance with the results of these calculations, the selection of an appropriate model among different potential polynomial models in local geoid modeling is explained in terms of theoretical references, an application is examined using the data from the study area, and the results are compared.

Keywords

Ellipsoidal height Orthometric heights Local GNSS/leveling geoid Geoid modeling Model selection criteria 

Notes

Acknowledgments

We thank Ostem Engineering Company for their support in obtaining the data used in this study and their technical support.

Supplementary material

12517_2018_4176_MOESM1_ESM.rar (145 kb)
ESM 1 Plots showing the differences in the predicted and observed geoid heights for the test points obtained using Models 1–5 (RAR 145 kb)

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Copyright information

© Saudi Society for Geosciences 2018

Authors and Affiliations

  1. 1.Department of Geomatics Engineering, Faculty of Engineering and Natural SciencesKonya Technical UniversityKonyaTurkey
  2. 2.Department of Soil Science, Faculty of AgricultureIgdir UniversityIgdirTurkey

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