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Application of the one-step integration method for determination of the regional gravimetric geoid

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Abstract

The regional gravimetric geoid solved using boundary-value problems of the potential theory is usually determined in two computational steps: (1) downward continuing ground gravity data onto the geoid using inverse Poisson’s integral equation in a mass-free space and (2) evaluating geoidal heights by applying Stokes integral to downward continued gravity. In this contribution, the two integration steps are combined in one step and the so-called one-step integration method in spherical approximation is implemented to compute the regional gravimetric geoid model. Advantages of using the one-step integration method instead of the two integration steps include less computational cost, more stable numerical computation and better utilization of input ground gravity data (reduced in each integration step to avoid edge effects). A discrete form of the one-step integral equation is used to convert mean values of ground gravity anomalies into mean values of geoidal heights. To evaluate mean values of the integral kernel in the vicinity of the computation point, a fast and numerically accurate analytical formula is proposed using planar approximation. The proposed formula is tested to determine the regional gravimetric geoid of the Auvergne test area, France. Results show a good agreement of the estimated geoid with geoidal heights estimated at GNSS-levelling reference points, with the standard deviation for the difference of 3.3 cm. Considering the uncertainty of geoidal heights derived at the GNSS/levelling reference points, one can conclude the geoid models computed by the one-step and two-step integration methods have negligible differences. Thus, the one-step method can be recommended for regional geoid modelling with its methodological and numerical advantages.

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Acknowledgements

Pavel Novák was supported by the Project 18-06943S of the Czech Science Foundation.

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Authors and Affiliations

  1. Department of Civil Engineering, Shahrood University of Technology, Shahrood, Iran

    Mehdi Goli

  2. Department of Geodesy and Geomatics Engineering, University of New Brunswick, Fredericton, Canada

    Ismael Foroughi

  3. NTIS – New Technologies for the Information Society, Faculty of Applied Sciences, University of West Bohemia, Plzeň, Czech Republic

    Pavel Novák

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  1. Mehdi Goli
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  2. Ismael Foroughi
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Correspondence to Ismael Foroughi.

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Goli, M., Foroughi, I. & Novák, P. Application of the one-step integration method for determination of the regional gravimetric geoid. J Geod 93, 1631–1644 (2019). https://doi.org/10.1007/s00190-019-01272-8

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