International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
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Volume XLII-4/W16
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLII-4/W16, 515–522, 2019
https://doi.org/10.5194/isprs-archives-XLII-4-W16-515-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLII-4/W16, 515–522, 2019
https://doi.org/10.5194/isprs-archives-XLII-4-W16-515-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

  01 Oct 2019

01 Oct 2019

GRAVIMETRIC GEOID MODELLING OVER PENINSULAR MALAYSIA USING TWO DIFFERENT GRIDDING APPROACHES FOR COMBINING FREE AIR ANOMALY

M. F. Pa’suya1,2, A. H. M. Din2,3, J. C. McCubbine4, A. H. Omar2, Z. M. Amin3, and N. A. Z. Yahaya2 M. F. Pa’suya et al.
  • 1Center of Studies for Surveying Science and Geomatics, Faculty of Architecture, Planning & Surveying, Universiti Teknologi MARA, Perlis, Arau Campus, 02600 Arau, Perlis, Malaysia
  • 2Geomatics Innovation Research Group (GNG), Faculty of Built Environment and Surveying, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor, Malaysia
  • 3Geoscience and Digital Earth Centre (INSTEG), Faculty of Built Environment and Surveying, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor, Malaysia
  • 4Geodesy Section, Community Safety and Earth Monitoring Division, Geoscience Australia, GPO Box 378, Canberra, ACT 2601, Australia

Keywords: LSMSA, KTH method, gravimetric geoid, Peninsular Malaysia

Abstract. We investigate the use of the KTH Method to compute gravimetric geoid models of Malaysian Peninsular and the effect of two differing strategies to combine and interpolate terrestrial, marine DTU17 free air gravity anomaly data at regular grid nodes. Gravimetric geoid models were produced for both free air anomaly grids using the GOCE-only geopotential model GGM GO_CONS_GCF_2_SPW_R4 as the long wavelength reference signal and high-resolution TanDEM-X global digital terrain model. The geoid models were analyzed to assess how the different gridding strategies impact the gravimetric geoid over Malaysian Peninsular by comparing themto 172 GNSS-levelling derived geoid undulations. The RMSE of the two sets of gravimetric geoid model / GNSS-levelling residuals differed by approx. 26.2 mm. When a 4-parameter fit is used, the difference between the RMSE of the residuals reduced to 8 mm. The geoid models shown here do not include the latest airborne gravity data used in the computation of the official gravimetric geoid for the Malaysian Peninsular, for this reason they are not as precise.