Evaluation of several geoid models for GNSS height transformation in Turkiye

Arzu Soycan; Yalçın Yılmaz; Metin Soycan

Article Details

Evaluation of several geoid models for GNSS height transformation in Turkiye

Authors:

Arzu Soycan | Yalçın Yılmaz | Metin Soycan

Publisher:

Yildiz Technical University

Main Topics:

Empirical Software Engineering

Journal:

Sigma Journal of Engineering and Natural Sciences Vol.41 Issue 1, pp.130-144

Document Type:

Article

Publication Date:

3/2023

Document Language:

English

Document ID (Org No.):

2001304946

pISSN:

1304-7191

Keywords:

Abstract:

 The main purpose of this paper is to present the results of external quality tests for global, regional and local geoid models. In this context, available geoid models were evaluated for the height transformation in three different geographic locations in Turkiye on the basis of ground truth GNSSLeveling data. The d ifferences between observed and computed quantities were investigated. The comparison results of the global, regional and local geoid models for three test areas were presented. The tested geoids are the national geoid model Turkiye-Geoid2003 TG-03 released by the General Command of Mapping in 2003 which was computed using land and sea gravity data, topographic heights from digital terrain model and GPSLeveling data, including EGM96 global geopotential model for long wavelengths, the ultra-high resolution model EGM2008 that was released by the US National Geospatial Intelligence Agency, the refined versions of these two geoid models and the GNSSLeveling derived geometric models produced by the metropolitan municipalities. The comparison of results show that TG03 and EGM2008 models provide about 2 times lower accuracy than the precise local geoid models. In addition, the RMS values of the other two methods IMPTG03 and IMPEGM2008 compared in the study were obtained as 2.45cm Istanbul, 5.09cm Izmır and 4.77cm Bursa for IMPTG03, 2.61cm Istanbul, 5.45cm Izmır and 5cm Bursa for IMPEGM2008. It seems that the results are suffici t for many engineering applications in the local areas and EGM2008 can be reach the accuracy of regional or local geoid models after the improvement procedure.

 The main purpose of this paper is to present the results of external quality tests for global, regional and local geoid models. In this context, available geoid models were evaluated for the height transformation in three different geographic locations in Turkiye on the basis of ground truth GNSSLeveling data. The d ifferences between observed and computed quantities were investigated. The comparison results of the global, regional and local geoid models for three test areas were presented. The tested geoids are the national geoid model Turkiye-Geoid2003 TG-03 released by the General Command of Mapping in 2003 which was computed using land and sea gravity data, topographic heights from digital terrain model and GPSLeveling data, including EGM96 global geopotential model for long wavelengths, the ultra-high resolution model EGM2008 that was released by the US National Geospatial Intelligence Agency, the refined versions of these two geoid models and the GNSSLeveling derived geometric models produced by the metropolitan municipalities. The comparison of results show that TG03 and EGM2008 models provide about 2 times lower accuracy than the precise local geoid models. In addition, the RMS values of the other two methods IMPTG03 and IMPEGM2008 compared in the study were obtained as 2.45cm Istanbul, 5.09cm Izmır and 4.77cm Bursa for IMPTG03, 2.61cm Istanbul, 5.45cm Izmır and 5cm Bursa for IMPEGM2008. It seems that the results are suffici t for many engineering applications in the local areas and EGM2008 can be reach the accuracy of regional or local geoid models after the improvement procedure.

 The main purpose of this paper is to present the results of external quality tests for global, regional and local geoid models. In this context, available geoid models were evaluated for the height transformation in three different geographic locations in Turkiye on the basis of ground truth GNSSLeveling data. The d ifferences between observed and computed quantities were investigated. The comparison results of the global, regional and local geoid models for three test areas were presented. The tested geoids are the national geoid model Turkiye-Geoid2003 TG-03 released by the General Command of Mapping in 2003 which was computed using land and sea gravity data, topographic heights from digital terrain model and GPSLeveling data, including EGM96 global geopotential model for long wavelengths, the ultra-high resolution model EGM2008 that was released by the US National Geospatial Intelligence Agency, the refined versions of these two geoid models and the GNSSLeveling derived geometric models produced by the metropolitan municipalities. The comparison of results show that TG03 and EGM2008 models provide about 2 times lower accuracy than the precise local geoid models. In addition, the RMS values of the other two methods IMPTG03 and IMPEGM2008 compared in the study were obtained as 2.45cm Istanbul, 5.09cm Izmır and 4.77cm Bursa for IMPTG03, 2.61cm Istanbul, 5.45cm Izmır and 5cm Bursa for IMPEGM2008. It seems that the results are suffici t for many engineering applications in the local areas and EGM2008 can be reach the accuracy of regional or local geoid models after the improvement procedure.

 The main purpose of this paper is to present the results of external quality tests for global, regional and local geoid models. In this context, available geoid models were evaluated for the height transformation in three different geographic locations in Turkiye on the basis of ground truth GNSSLeveling data. The d ifferences between observed and computed quantities were investigated. The comparison results of the global, regional and local geoid models for three test areas were presented. The tested geoids are the national geoid model Turkiye-Geoid2003 TG-03 released by the General Command of Mapping in 2003 which was computed using land and sea gravity data, topographic heights from digital terrain model and GPSLeveling data, including EGM96 global geopotential model for long wavelengths, the ultra-high resolution model EGM2008 that was released by the US National Geospatial Intelligence Agency, the refined versions of these two geoid models and the GNSSLeveling derived geometric models produced by the metropolitan municipalities. The comparison of results show that TG03 and EGM2008 models provide about 2 times lower accuracy than the precise local geoid models. In addition, the RMS values of the other two methods IMPTG03 and IMPEGM2008 compared in the study were obtained as 2.45cm Istanbul, 5.09cm Izmır and 4.77cm Bursa for IMPTG03, 2.61cm Istanbul, 5.45cm Izmır and 5cm Bursa for IMPEGM2008. It seems that the results are suffici t for many engineering applications in the local areas and EGM2008 can be reach the accuracy of regional or local geoid models after the improvement procedure.

Article Details

Evaluation of several geoid models for GNSS height transformation in Turkiye

Authors:

Arzu Soycan | Yalçın Yılmaz | Metin Soycan

Publisher:

Yildiz Technical University

Main Topics:

Empirical Software Engineering

Journal:

Sigma Journal of Engineering and Natural Sciences Vol.41 Issue 1, pp.130-144

Document Type:

Article

Publication Date:

3/2023

Document Language:

English

Document ID (Org No.):

2001304946

pISSN:

1304-7191

GNSS

Height Transformation

Geoid

EGM2008

Leveling Geoid

Issues

Article Details

Evaluation of several geoid models for GNSS height transformation in Turkiye

Authors: Arzu Soycan | Yalçın Yılmaz | Metin Soycan

Publisher: Yildiz Technical University

Main Topics: Empirical Software Engineering

Journal: Sigma Journal of Engineering and Natural Sciences Vol.41 Issue 1, pp.130-144

Document Type: Article

Publication Date: 3/2023

Document Language: English

Document ID (Org No.): 2001304946

pISSN: 1304-7191

GNSS

Height Transformation

Geoid

EGM2008

Leveling Geoid

Issues

Authors:

Arzu Soycan | Yalçın Yılmaz | Metin Soycan

Publisher:

Yildiz Technical University

Main Topics:

Empirical Software Engineering

Journal:

Sigma Journal of Engineering and Natural Sciences Vol.41 Issue 1, pp.130-144

Document Type:

Article

Publication Date:

3/2023

Document Language:

English

Document ID (Org No.):

2001304946

pISSN:

1304-7191