Assessment of high-resolution global gravity field models and their application in Quasi-geoid modelling in Finland

Mirjam Bilker-Koivula*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

3 Citations (Scopus)

Abstract

The two high-resolution global gravity field models, EGM2008 and EIGEN-6C, are compared with ground truth in Finland and surrounding areas. Thereafter, the models are used as background models in the calculation of a quasi-geoid model for Finland. The differences between height anomalies calculated from the globalmodels and from two GPSlevelling datasets for Finland show standard deviations between 5 and 7 cm. Comparisons with free-air anomalies show small and homogeneously distributed differences over most of the area. In both comparisons the largest discrepancies are found close to the Russian border east of the 29° longitude line. This is most probably due to lower resolution Russian data used in the global models. When the global models are used as background models in the calculation of a quasi-geoid model for Finland, the problems around the 29° longitude line disappear. Comparison between the final quasi-geoid models and GPS-levelling data show an improvement over earlier models for Finland.

Original languageEnglish
Title of host publicationGravity, Geoid and Height Systems - IAG Symposium GGHS2012, Proceedings
PublisherSpringer Verlag
Pages51-58
Number of pages8
Volume141
ISBN (Electronic)9783319108360
DOIs
Publication statusPublished - 2014
MoE publication typeA4 Article in a conference publication
EventINTERNATIONAL ASSOCIATION OF GEODESY SYMPOSIA -
Duration: 1 Jan 1900 → …

Conference

ConferenceINTERNATIONAL ASSOCIATION OF GEODESY SYMPOSIA
Period01/01/1900 → …

Keywords

  • EGM2008
  • EIGEN-6C
  • GPS-levelling
  • Quasi-geoid modelling

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