Comparison of Satellite Altimetric Gravity and Global Geopotential Models with Shipborne Gravity in the Red Sea

Zaki, Ahmed; Mansi, Ahmed Hamdi; Selim, Mohamed; Rabah, Mostafa; El-Fiky, Gamal

doi:10.1080/01490419.2017.1414088

Cited by 33 publications

(7 citation statements)

References 36 publications

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“…On oceans, marine gravity data are seen as reference of absolute gravity value. It is common practice to consider that the accuracy of a gravity anomaly model derived from satellite altimetry can be estimated locally, as the standard deviation of its difference with a marine data set (Andersen et al., 2019; Denker & Roland, 2005; Small & Sandwell, 1992; Zaki et al., 2018). To be complete the comparison should consider the uncertainty of the data set itself.…”

Section: Methodsmentioning

confidence: 99%

“…It is usually made from marine gravity data. The reader will find in the literature a large number of examples among which the authors of the models (Andersen et al., 2019; Keating & Pinet, 2013; Lequentrec‐Lalancette et al., 2016; Sandwell & Smith, 2009; Sandwell et al., 2013; Zaki et al., 2018). If a statistical difference is made between the marine data and the model, to better constrain the comparison, some authors estimate the spectral correlation along a profile or on a localized grid, thus estimating the smallest significant wavelength for the calculation of the model accuracy (Marks et al., 2013; Sandwell et al., 2021; Zaki et al., 2018).…”

Section: Introductionmentioning

confidence: 99%

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Using Marine Data to Estimate the Accuracy of Free Air Gravity Anomaly Models Derived From Satellite Altimetry

Rouxel

Sarzeaud²,

Lequentrec-Lalancette

2023

Earth and Space Science

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Global gravity models from satellite altimetry missions have widely contributed to the improvement of the knowledge over the oceans. However, few models are available with a validated accuracy model, as the most recent models V21 to V32 from Scripps Institution of Oceanography (SIO). The aim of this paper is to propose a method to estimate the accuracy of any free air gravity anomaly model derived from satellite altimetry from validated marine data sets. The main idea is to correlate the error of the model to the mean roughness of the free air gravity anomaly on precise marine measurement areas. The relationship obtained is then generalized to each point of the model. This error grid is eventually combined with the grid provided by the satellite models, reflecting the errors related to the technology of the different altimetry satellites used. The method has been successfully applied to successive versions of SIO gravity anomaly models (from V18 to V31) to produce continuous accuracy grids over the North Atlantic Ocean. Validation of the results from independent marine data shows that the proposed approach allows to strongly improve the estimation of the used models' accuracy which converges, whatever the tested versions, toward a minimal value of 0.9 mGal over flat areas.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Using Marine Data to Estimate the Accuracy of Free Air Gravity Anomaly Models Derived From Satellite Altimetry

Rouxel

Sarzeaud²,

Lequentrec-Lalancette

2023

Earth and Space Science

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“…The residual grid obtained is finally added to that of the gravity data derived from the EGM2008 model to increase the latter's accuracy at high frequencies. This method has been already successfully used to combine marine gravity data with altimetric models [32].…”

Section: Methodmentioning

confidence: 99%

Combination of Terrestrial and Satellite Gravity Data for the Characterization of the Southwestern Coastal Region of Cameroon: Appraisal for Hydrocarbon Exploration

Kamto

Lemotio

Tokam

et al. 2021

International Journal of Geophysics

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The southwestern coastal region of Cameroon is an area of interest because of its hydrocarbon potential (gas and oil). Terrestrial and satellite gravity data were combined and analyzed to provide a better precision in determining the structure of the study area. Firstly, the two gravity databases (in situ and satellite) have been coupled and validated using the least square collocation technique. Then, spectral analysis was applied to the combined Bouguer anomaly map to evaluate the thickness of sediments in some localities. We found that the sedimentary cover of the southwestern coastal region of Cameroon has a thickness that varies laterally from 1.68 ± 0.08 to 2.95 ± 0.15 km , especially in the western part. This result confirms that our target area is a potential site for hydrocarbon exploration. The horizontal gradient method coupled with the upward continuation at variable heights has been used to highlight several lineaments and their directions (N-S, E-W, SW-NE, and SSW-NNE). Lineaments trending in an N-S orientation are predominant. The Euler deconvolution method was also applied to the Bouguer anomaly map to determine the position, orientation, and depth of the different superficial faults of the study area. It appears that the majority of superficial faults have an N-S and SSW-NNE orientation. These directions are correlated with those previously highlighted by the maxima of horizontal gradient. The structural map could be used for a better identification of the direction of fluid flow within the subsurface or to update the geological map of our study area.

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“…These components are actually the terrain effects of the so‐called residual terrain model (RTM) (Forsberg, 1984). This method has been successfully applied by many authors (Forsberg, 1985; Hirt et al, 2010; Sampietro et al, 2017; Zaki et al, 2018) to improve the performance of GGM on areas with a very rough topography.…”

Section: Methodsmentioning

confidence: 99%

Refinement of Bouguer anomalies derived from the EGM2008 model, impact on gravimetric signatures in mountainous region: Case of Cameroon Volcanic Line, Central Africa

Kamto

Adiang

Nguiya

et al. 2020

Earth and Planetary Physics

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Comparison of Satellite Altimetric Gravity and Global Geopotential Models with Shipborne Gravity in the Red Sea

Cited by 33 publications

References 36 publications

Using Marine Data to Estimate the Accuracy of Free Air Gravity Anomaly Models Derived From Satellite Altimetry

Using Marine Data to Estimate the Accuracy of Free Air Gravity Anomaly Models Derived From Satellite Altimetry

Combination of Terrestrial and Satellite Gravity Data for the Characterization of the Southwestern Coastal Region of Cameroon: Appraisal for Hydrocarbon Exploration

Refinement of Bouguer anomalies derived from the EGM2008 model, impact on gravimetric signatures in mountainous region: Case of Cameroon Volcanic Line, Central Africa

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