pyGABEUR-ITB: A FREE SOFTWARE FOR ADJUSTMENT OF RELATIVE GRAVIMETER DATA

Dudy Darmawan Wijaya, Norman Arif Muhamad, Kosasih Prijatna, Arisauna Pahlevi, Erfan Variandy, Widy Putra

Abstract


pyGABEUR-ITB (Python GayaBEUrat Relatif – Institut Teknologi Bandung) is a free and interactive software for adjustment of relative gravimeter data, developed based on Python programming language. pyGABEUR-ITB can adjust relative gravity measurements and provide reliable estimates for correcting instrument’s systematic errors, such as gravimeter drift. Furthermore, pyGABEUR-ITB can also detect possible outliers in the observations using the t-criterion method. Since pyGABEUR-ITB is using the weighted constraint adjustment, at least one fixed station is required accordingly. Relative gravimeter data around Palu-Donggala area (Central Sulawesi) observed by Center for Geodesy Control Networks and Geodynamics, Geospatial Information Agency, were used to test the performance of pyGABEUR-ITB. The processing results were then compared against those calculated using GRAVNET software. The comparisons show that both pyGABEUR-ITB and GRAVNET softwares statistically provide simillar results, with the total RMS value of about 5 mGal. In term of computer’s requirement, pyGABEUR-ITB can be excecuted under a computer with the following minimal requirements: x64 CPU, 1 GB memory and WINDOWS 7 OS. Finally, it is important to mention that pyGABEUR-ITB is recently suited to process the data from the gravimeter that adopts the principle of vertical spring balance. In the near future, pyGABEUR-ITB will be extended to be able to automatically adapt to various observation principles.


Keywords


free software; python; relative-gravity; constrained adjustment

Full Text:

PDF

References


Baarda, W. (1968). A Testing Procedure for Use in Geodetic Networks. Publications on Geodesy, 2(5), 97.

Caspary, W. F. (1987). Concepts of Network and Deformation Analysis, Monograph 11. Kensington: The University of New South Wales.

Ghilani, C. D. (2010). Adjustment Computations: Spatial Data Analysis: Fifth Edition (5th ed.). https://doi.org/10.1002/9780470586266

Hwang, C., Wang, C. G., & Lee, L. H. (2002). Adjustment of Relative Gravity Measurements Using Weighted and Datum-free Constraints. Computers and Geosciences, 28(9), 1005–1015. https://doi.org/10.1016/S0098-3004(02)00005-5

Koch, K.-R. (1999). Parameter Estimation and Hypothesis Testing in Linear Models (2nd ed.). https://doi.org/10.1007/978-3-662-03976-2

Krieg, L. A. (1982). Mathematical Modelling of the Behavior of the LaCoste and Romberg" G" Gravity Meter for Use in Gravity Network Adjustment and Data Analysis. The Ohio State University.

Lagios, E. (1984). A FORTRAN IV Program for a Least-squares Gravity Base-station Network Adjustment. Computers and Geosciences. https://doi.org/10.1016/0098-3004(84)90026-8

Lerch, F. J. (1991). Optimum Data Weighting and Error Calibration for Estimation of Gravitational Parameters. Bulletin Géodésique. https://doi.org/10.1007/BF00806341

Longman, I. M. (1959). Formulas for Computing the Tidal Accelerations Due to the Moon and the Sun. Journal of Geophysical Research, 64(12), 2351–2355. https://doi.org/10.1029/jz064i012p02351

Matsumoto, K., Sato, T., Takanezawa, T., & Ooe, M. (2001). GOTIC2: A Program for Computation of Oceanic Tidal Loading Effect. Journal of the Geodetic Society of Japan, 47(1), 243–248. https://doi.org/10.11366/sokuchi1954.47.243

Pope, A. J. (1976). The Statistics of Residuals and the Detection of Outliers. University of California Libraries.

Tapley, B. D., Born, G. H., & Parke, M. E. (1982). The Seasat Altimeter Data and Its Accuracy Assessment. Journal of Geophysical Research: Oceans, 87(C5), 3179–3188.

Timmen, L. (2010). Absolute and Relative Gravimetry. Sciences of Geodesy - I: Advances and Future Directions, 1–48. https://doi.org/10.1007/978-3-642-11741-1

Torge, W. (1989). Gravimetry de Gruyter. New York: New York.

Tscherning, C. C. (1991). A strategy for Gross-error Detection in Satellite Altimeter Data Applied in the Baltic-sea Area for Enhanced Geoid and Gravity Determination. Determination of the Geoid, 95–107. Springer, New York.

Van Camp, M., Williams, S. D., & Francis, O. (2005). Uncertainty of Absolute Gravity Measurements. Journal of Geophysical Research: Solid Earth, 110(B5), 1–9. https://doi.org/10.1029/2004JB003497

Wahr, J. M. (1985). Deformation Induced by Polar Motion. Journal of Geophysical Research, 90(1), 9363–9368. https://doi.org/10.1029/JB090iB11p09363

Wijaya, D. D., Muhammad, N. A., & Prijatna, K. (2018). GABUER-ITB: Pengolahan Data Gayaberat Relatif Menggunakan Matlab.

Zhiheng, J., Chuanhui, Z., Qixian, Q., & Shan, X. (1988). China Gravity Basic Net 1985. Science in China Series B-Chemistry, Biological, Agricultural, Medical & Earth Sciences, 31(9), 1143–1152.




DOI: http://dx.doi.org/10.24895/JIG.2019.25-2.991

Article Metrics

Abstract view : 0 times
PDF - 0 times

Refbacks

  • There are currently no refbacks.


Copyright (c) 2019 GEOMATIKA

Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

Geomatika Indexed by:

 

Copyright of Geomatika