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Downward continuation of Geopotential in Switzerland

Ameti, Perparim (2006)
Downward continuation of Geopotential in Switzerland.
Technische Universität Darmstadt
Ph.D. Thesis, Primary publication

Abstract

The main objective of this thesis is the downward continuation of the Geopotential in Switzerland. The downward continuation of the airborne gravity data in Switzerland is a challenging task, due to the well known mountainous topography (Alps) . Another interesting factor for the analysis of the downward continuation process is the measurement height (Flight-line altitude), which is about 5000m above sea level. Taking into account these factors, it is convenient to study the downward continuation process using different computation methods as well as different techniques that take into account the topography. The Principal method proposed in this thesis for the downward continuation of Geopotential in Switzerland is the combination of the Sequential Multipole Analysis (SMA) and Least Square Collocation (LSC) with regularization in the Bjerhammar-Krarup model. This method is then compared with the inverse Poisson’s integral method. To improve the stability of the downward continuation process, a number of land (19 GPS/leveling points) data is included in the calculation. The final results from both methods are stored as geoid undulations and are compared with the actual geoid of Switzerland CHGeo98. Since the topography of Switzerland is rough in the south and relative smooth in the north, I propose to use different terrain correction techniques, the second Helmert’s condensation technique and the Residual Terrain Model (RTM) technique.

Item Type: Ph.D. Thesis
Erschienen: 2006
Creators: Ameti, Perparim
Type of entry: Primary publication
Title: Downward continuation of Geopotential in Switzerland
Language: English
Referees: Becker, Prof. Dr. Mathias ; Martinec, Prof. Dr. Zdenek
Advisors: Groten, Prof. Dr. Erwin
Date: 28 March 2006
Place of Publication: Darmstadt
Publisher: Technische Universität
Refereed: 30 June 2005
URL / URN: urn:nbn:de:tuda-tuprints-6714
Abstract:

The main objective of this thesis is the downward continuation of the Geopotential in Switzerland. The downward continuation of the airborne gravity data in Switzerland is a challenging task, due to the well known mountainous topography (Alps) . Another interesting factor for the analysis of the downward continuation process is the measurement height (Flight-line altitude), which is about 5000m above sea level. Taking into account these factors, it is convenient to study the downward continuation process using different computation methods as well as different techniques that take into account the topography. The Principal method proposed in this thesis for the downward continuation of Geopotential in Switzerland is the combination of the Sequential Multipole Analysis (SMA) and Least Square Collocation (LSC) with regularization in the Bjerhammar-Krarup model. This method is then compared with the inverse Poisson’s integral method. To improve the stability of the downward continuation process, a number of land (19 GPS/leveling points) data is included in the calculation. The final results from both methods are stored as geoid undulations and are compared with the actual geoid of Switzerland CHGeo98. Since the topography of Switzerland is rough in the south and relative smooth in the north, I propose to use different terrain correction techniques, the second Helmert’s condensation technique and the Residual Terrain Model (RTM) technique.

Alternative Abstract:
Alternative abstract Language

Die Doktorarbeit untersucht die Möglichkeiten, das Potentials der Erde durch Fortsetzung nach unten zu bestimmen. Als Ausgangsdaten werden Schwerewerte, die durch Fluggravimetrie über der Schweiz beobachtet wurden, benutzt. Die Bearbeitung der Ergebnisse von Fluggravimetrierungen über alpinen Gegenden stellt wegen der großen Flughöhe und der sehr rauen Topographie sehr hohe Anforderungen an die verwendeten Methoden. Daher werden in der vorliegenden Dissertation verschiedene Techniken benutzt, um den Einfluss der Topographie zu ermitteln. Die prinzipielle Methode basiert hierbei auf der Kombination einer sequentiellen Multipolanalyse (SMA) und einer kleinsten Quadrate Kollokation (LSC) mit Regularisierung im Bjerhammar-Karup Modell. Diese Methode wird mit der inversen Poisson Integral Methode verglichen. Zur Verbesserung der Lösung der Fortsetzung nach unten werden terrestrisch beobachtete daten (19 GPS/leveling punkte) in der Berechnung eingeführt . Die berechneten Geoidundulationen beider Methoden werden mit dem aktuellen Geoid der Schweiz CHGeo98 verglichen. Da die Topographie der Schweiz im Norden sehr flach, im Süden jedoch sehr rau ist, werden in der Arbeit zwei verschiedene Techniken angewandt, die den topographischen Effekt berücksichtigen; die 2. Helmert Kondensation und die Residual Terrain Model (RTM) Technik.

German
Uncontrolled Keywords: Feldfortsetzung nach unten, Fluggravimetrie, geoid
Alternative keywords:
Alternative keywordsLanguage
Downward continuation, airborne gravity, geoidEnglish
Classification DDC: 500 Naturwissenschaften und Mathematik > 550 Geowissenschaften
Divisions: 13 Department of Civil and Environmental Engineering Sciences
Date Deposited: 17 Oct 2008 09:22
Last Modified: 26 Aug 2018 21:25
PPN:
Referees: Becker, Prof. Dr. Mathias ; Martinec, Prof. Dr. Zdenek
Refereed / Verteidigung / mdl. Prüfung: 30 June 2005
Alternative keywords:
Alternative keywordsLanguage
Downward continuation, airborne gravity, geoidEnglish
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