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Journal articles on the topic 'Gravimetric geoid height'

Author: Grafiati

Published: 4 June 2025

Last updated: 1 August 2025

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1

Sjöberg, Lars E. "On the topographic bias and density distribution in modelling the geoid and orthometric heights." Journal of Geodetic Science 8, no. 1 (2018): 30–33. http://dx.doi.org/10.1515/jogs-2018-0004.

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Abstract It is well known that the success in precise determinations of the gravimetric geoid height (N) and the orthometric height (H) rely on the knowledge of the topographic mass distribution. We show that the residual topographic bias due to an imprecise information on the topographic density is practically the same for N and H, but with opposite signs. This result is demonstrated both for the Helmert orthometric height and for a more precise orthometric height derived by analytical continuation of the external geopotential to the geoid. This result leads to the conclusion that precise gra

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Zablotskyi, F., V. Maksymchuk, and B. Dzhuman. "On the construction of gravimetric geoid model on the Lviv region area." Geofizicheskiy Zhurnal 44, no. 1 (2022): 124–30. http://dx.doi.org/10.24028/gzh.v44i1.253714.

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Baltic Height System 1977, currently used in Ukraine, the starting point of which is the zero of the Kronstadttide-gauge, isobsoletedue to the great distance from the zero-point of the reference height and the difficulty of adapting satellite methods of geodesy. For the successful modernization of the height system of Ukraine, it is necessary to integrate it into the United European Leveling Network (UELN). For the full functioning of any modern height system, namely to determine the gravity-depend heights by satellite methods, it is necessary to operate with a high-precision geoid model. Ther

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ETEJE, S. O., O. F. ODUYEBO, and S. A. OLULADE. "Procedure for the Determination of Local Gravimetric-Geometric Geoid Model." International Journal of Advances in Scientific Research and Engineering (ijasre) 4, no. 8 (2018): 206–14. https://doi.org/10.5281/zenodo.2525708.

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As the surface adopted for geodetic computation is a mathematical surface which is different from the physical surface, the geoid adopted as a reference for the vertical coordinate system, the ellipsoidal heights obtained from GPS observation are transformed to practical heights known as orthometric heights. The transformation of the ellipsoidal heights to orthometric heights requires the knowledge of the geoid-ellipsoid separation at the point of observation. Since the geometric method requires the computation of geoid heights of points from GPS observation and geodetic leveling carried out o

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Sjöberg, Lars E. "Geoid model validation and topographic bias." Journal of Geodetic Science 12, no. 1 (2022): 38–41. http://dx.doi.org/10.1515/jogs-2022-0133.

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Abstract Recently a number of geoid campaigns were performed to verify different types of geoid and quasigeoid modeling techniques. Typically, GNSS-leveling was employed as an independent method, but in some cases zenith camera astronomic deflection data were also used in astrogeodetic determinations of the geoid and/or quasigeoid. However, due to the uncertainty in the topographic density distribution data (and thereby in orthometric heights), we conclude that neither GNSS-leveling nor astrogeodetic techniques can reliably verify differences between gravimetric geoid models at several centime

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Osman, Anas Sharafeldin Mohamed, and Ira Mutiara Anjasmara. "Determination of a new gravimetric geoid modelling for Sudan using the least-squares collocation technique." IOP Conference Series: Earth and Environmental Science 1127, no. 1 (2023): 012014. http://dx.doi.org/10.1088/1755-1315/1127/1/012014.

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Abstract The main purpose of this study is to compute a new gravimetric geoid model for Sudan by using the least-square collocation technique (LSC method) and applying the remove-compute-restore (RCR) technique. The computation of the model contains different datasets which are the gravity contribution of the model GO_CONS_GCF_2_TIM_R6e degree/order 300, BGI free-air gravity dataset in Sudan, GPS/levelling data, and high-resolution topographic information from ASTER digital elevation model. The “residual gravity anomalies” were run through the GEOCOL program using the GRAVSOFT software package

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ABD-ELMOTAAL, Hussein, and Atef MAKHLOOF. "Two alternative techniques for fitting the gravimetric geoid for Egypt." Contributions to Geophysics and Geodesy 53, no. 4 (2023): 377–98. http://dx.doi.org/10.31577/congeo.2023.53.4.4.

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In this paper, two proposed geoid fitting techniques for Egypt's gravimetrically determined geoid and Global Positioning System GPS/levelling-derived geoid are introduced. First, any errors in the available GPS stations are ruled out. These methods rely on the absolute geoid difference, which is the gravimetric geoid height minus the geoid obtained through comparing GPS and levelling. The suggested geoid fitting techniques use an optimization algorithm scheme to choose the minimum number of the best-suited GPS stations to be used for fitting the gravimetric geoid. The least-squares collocation

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ETEJE, S. O., M. N. ONO, and O. F. ODUYEBO. "Practical Local Geoid Model Determination for Mean Sea Level Heights of Surveys and Stable Building Projects." IOSR Journal of Environmental Science, Toxicology and Food Technology (IOSR-JESTFT) 12, no. 6 (2018): 30–37. https://doi.org/10.5281/zenodo.2525661.

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A local geoid model for Evboriaria, Benin City using the geometric (GPS/Levelling) method was determined for calculation of mean sea level heights. Fifty points were established for the model and ten points were used for interpolation. The geoid heights were determined by finding the difference between the observed orthometric heights and the ellipsoidal heights. The polynomial regression model D was used for the interpolation of the orthometric heights. The computed mean standard deviation between the observed orthometric heights and the interpolated orthometric heights was ± 21cm. A m

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Jürgenson, Harli, Kristina Türk та Jüri Randjärv. "DETERMINATION AND EVALUATION OF THE ESTONIAN FITTED GEOID MODEL EST-GEOID 2003 / ESTIJOS GEOIDO MODELIO EST-GEOID 2003 SUDARYMAS IR VERTINIMAS / СОЗДАНИЕ И ОЦЕНКА МОДЕЛИ ГЕОИДА ЭСТОНИИ EST-GEOID2003". Geodesy and Cartography 37, № 1 (2011): 15–21. http://dx.doi.org/10.3846/13921541.2011.558339.

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This paper focuses on issues related to the calculation of a high-precision fitted geoid model on Estonian territory. Model Est-Geoid2003 have been used in Estonia several years in geodesy and other applications. New data from precise levelling, new global models and terrestrial gravity data give plenty of possibilities for updates and accuracy evaluation. The model is based on a gravimetric geoid. From the gravimetric data gathered, a gravimetric geoid for Estonia was calculated as an approximately 3-km net using the FFT method. After including the new gravimetric data gathered, the gravimetr

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Lukoševičius, Viktoras. "DFHRS-BASED COMPUTATION OF QUASI-GEOID OF LATVIA." Geodesy and Cartography 39, no. 1 (2013): 11–17. http://dx.doi.org/10.3846/20296991.2013.788827.

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In geodesy, civil engineering and related fields high accuracy coordinate determination is needed, for that reason GNSS technologies plays important role. Transformation from GNSS derived ellipsoidal heights to orthometric or normal heights requires a high accuracy geoid or quasi-geoid model, respectively the accuracy of the currently used Latvian gravimetric quasi-geoid model LV'98 is 6–8 cm. The objective of this work was to calculate an improved quasi-geoid (QGeoid) for Latvia. The computation was performed by applying the DFHRS software. This paper discusses obtained geoid height reference

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Ramdani, D., A. N. Safi’i, P. Hartanto, N. Oktaviani, and M. I. Hariyono. "Verification of the Jakarta Geoid Model from the Gravity Data of 2.5 km Resolution with Gravimetric Geoid." IOP Conference Series: Earth and Environmental Science 873, no. 1 (2021): 012045. http://dx.doi.org/10.1088/1755-1315/873/1/012045.

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Abstract To use the Global Navigation Satellite System (GNSS) correctly, the height information should be transformed into orthometric height by subtracting geoid undulation from it. This orthometric height is commonly used for practical purposes. In 2015 geoid of Jakarta has been produced, and it has an accuracy of 0.076 m. In the year 2019, airborne gravimetry has been done for the entire Java Island. The area of DKI Province cannot be measured because there is inhibition from Airnav. For this reason, terrestrial gravimetric measurements are carried out in this region by adding points outsid

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Mustafin, Murat, and Hiba Moussa. "Accurate Height Determination in Uneven Terrains with Integration of Global Navigation Satellite System Technology and Geometric Levelling: A Case Study in Lebanon." Computation 12, no. 3 (2024): 58. http://dx.doi.org/10.3390/computation12030058.

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The technology for determining a point’s coordinates on the earth’s surface using the global navigation satellite system (GNSS) is becoming the norm along with ground-based methods. In this case, determining coordinates does not cause any particular difficulties. However, to identify normal heights using this technology with a given accuracy, special research is required. The fact is that satellite determinations of geodetic heights (h) over an ellipsoid surface differ from ground-based measurements of normal height (HN) over a quasi-geoid surface by a certain value called quasi-geoid height o

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Vergos, Georgios S., Dimitrios A. Natsiopoulos, Elisavet G. Mamagiannou, et al. "A Regional Gravimetric and Hybrid Geoid Model in Northern Greece from Dedicated Gravity Campaigns." Remote Sensing 17, no. 2 (2025): 197. https://doi.org/10.3390/rs17020197.

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The determination of physical heights is of key importance for a wide spectrum of geoscientific applications and, in particular, for engineering projects. The main scope of the present work is focused on the determination of a high-accuracy and high-resolution gravimetric and hybrid geoid model, to determine orthometric heights without the need of conventional leveling. Both historical and newly acquired gravity data have been collected during dedicated gravity campaigns, around the location of a dedicated GNSS network as well as areas where the existing land gravity database presented voids.

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Guo, Dongmei, Xiaodong Chen, Zhixin Xue, et al. "High-Accuracy Quasi-Geoid Determination Using Molodensky’s Series Solutions and Integrated Gravity/GNSS/Leveling Data." Remote Sensing 15, no. 22 (2023): 5414. http://dx.doi.org/10.3390/rs15225414.

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This study presents a methodology for constructing a quasi-geoid model with millimeter-level accuracy over the Shangyu area in China, following the guidelines of the International Association of Geodesy Joint Working Group 2.2.2, known as “The 1 cm geoid experiment”. Our approach combines two steps to ensure exceptional accuracy. First, we employ Molodensky’s theory to model the gravity field, accounting for non-level surfaces and considering complex terrain effects. Through an exhaustive analysis of these influential factors, we implement a comprehensive suite of applicable formulae within Mo

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Kim, Su-Kyung, Jihye Park, Daniel Gillins, and Michael Dennis. "On determining orthometric heights from a corrector surface model based on leveling observations, GNSS, and a geoid model." Journal of Applied Geodesy 12, no. 4 (2018): 323–33. http://dx.doi.org/10.1515/jag-2018-0014.

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Abstract Leveling is a traditional geodetic surveying technique that has been used to realize a vertical datum. However, this technique is time consuming and prone to accumulate errors, where it relies on starting from one station with a known orthometric height. Establishing orthometric heights using Global Navigation Satellite Systems (GNSS) and a geoid model has been suggested [14], but this approach may involve less precisions than the direct measurements from leveling. In this study, an experimental study is presented to adjust the highly accurate leveling observations along with orthomet

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Tocho, Claudia N., Ezequiel D. Antokoletz, Agustín R. Gómez, Hernán Guagni, and Diego A. Piñon. "Analysis of high-resolution global gravity field models for the estimation of International Height Reference System (IHRS) coordinates in Argentina." Journal of Geodetic Science 12, no. 1 (2022): 131–40. http://dx.doi.org/10.1515/jogs-2022-0139.

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Abstract Following the definition and realization of the International Height Reference System (IHRS), the vertical coordinate of a given point at the Earth’s surface can be obtained from the computation of the geopotential value from a harmonic expansion of a Global Gravity Model of High-Resolution (GGM-HR) or based on the computation of a local or regional pure gravimetric geoid or quasigeoid. Therefore, an evaluation of the accuracy of GGMs-HR and the geoid model available is needed in order to assess its capability to infer IHRS coordinates. In this study, different GGMs-HR are evaluated a

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Oluyori, P. D., M. N. Ono, and S. O. Eteje. "Modelling of Orthometric heights from Multi- Networks of GNSS/Precise Levelling in FCT, Abuja." International Journal of Environment, Agriculture and Biotechnology (IJEAB) 4, no. 4 (2019): 1173–80. https://doi.org/10.5281/zenodo.3376619.

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The geoid is used as a transformation linkage between ellipsoidal heights (h) determined from DGPS observations and orthometric heights (H). Widespread acceptability and adoption of GPS in local geospatial data acquisitions require the development of a local geoid model (N) for use to obtain orthometric heights in the absence of a national geoid model. Geoid model can be developed by gravimetric approach; global geopotential model (GGM); geometric technique among others. The conventional approach to GPS measurements is the use of one base reference station for field measurements. It has severa

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17

Nahavandchi, H., and A. Soltanpour. "Improved determination of heights using a conversion surface by combining gravimetric quasi-geoid/geoid and GPS-levelling height differences." Studia Geophysica et Geodaetica 50, no. 2 (2006): 165–80. http://dx.doi.org/10.1007/s11200-006-0010-3.

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18

Tenzer, R., R. Čunderlík, N. Dayoub, and A. Abdalla. "Application of the BEM approach for a determination of the regional marine geoid model and the mean dynamic topography in the Southwest Pacific Ocean and Tasman Sea." Journal of Geodetic Science 2, no. 1 (2012): 8–14. http://dx.doi.org/10.2478/v10156-011-0019-6.

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Application of the BEM approach for a determination of the regional marine geoid model and the mean dynamic topography in the Southwest Pacific Ocean and Tasman SeaWe apply a novel approach for the gravimetric marine geoid modelling which utilise the boundary element method (BEM). The direct BEM formulation for the Laplace equation is applied to obtain a numerical solution to the linearised fixed gravimetric boundary-value problem in points at the Earth's surface. The numerical scheme uses the collocation method with linear basis functions. It involves a discretisation of the Earth's surface w

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Raufu, Ibrahim Olatunji, and Herbert Tata. "Comparison of Two Corrector Surface Models of Orthometric Heights from GPS/Levelling Observations and Global Gravity Model." JGISE: Journal of Geospatial Information Science and Engineering 5, no. 1 (2022): 15. http://dx.doi.org/10.22146/jgise.72531.

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The advent of space-based measurement systems such as the Global Positioning System (GPS) offers a new alternative in orthometric height determination over conventional spirit levelling. The ellipsoidal height (h) obtained from GPS observations can be transformed into orthometric height if the geoid undulation (N) is known from a national gravimetric geoid model. However, the lack of a national geoid model in Nigeria hinders the use of the method. This study compares two corrector surface models of orthometric heights from GPS/levelling observations and the Global Gravity Model. Model A (7-par

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Ssengendo, Ronald, and Anthony Gidudu. "Towards a new height datum for Uganda." South African Journal of Geomatics 9, no. 2 (2022): 108–17. http://dx.doi.org/10.4314/sajg.v9i2.8.

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A new height datum for Uganda is computed using the corrective surface principle. It is based on a combination of the Uganda Gravimetric Quasigeoid model (UGQ) 2014 and GNSS/levelling. UGQ2014 was derived from the Uganda Gravimetric Geoid model (UGG) 2014, which was computed from sparse terrestrial gravity data from the International Gravimetric Bureau, the 3 arc second Shuttle Radar Topography Mission digital elevation model and the GOCE – only global geopotential model GO_CONS_GCF_2_TIM_R5. The corrective surface was constructed based on 21 discrete GNSS/levelling points and then evaluated w

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Véronneau, Marc, and Jianliang Huang. "The Canadian Geodetic Vertical Datum of 2013 (CGVD2013)." GEOMATICA 70, no. 1 (2016): 9–19. http://dx.doi.org/10.5623/cig2016-101.

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The Canadian Geodetic Vertical Datum of 2013 (CGVD2013) is the first major update to the vertical datum in Canada in almost 100 years. Canada is not only moving to a new vertical datum, but it is also using a modernized approach to realize it. The modernization of the height reference system is necessary to make it compatible with Global Navigation Satellite System (GNSS), which is commonly used for positioning by a growing number of users across Canada and the world. The geodetic levelling technique, which established a nation-wide network of benchmarks with known elevations, is replaced by a

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Fotopoulos, G. "Calibration of geoid error models via a combined adjustment of ellipsoidal, orthometric and gravimetric geoid height data." Journal of Geodesy 79, no. 1-3 (2005): 111–23. http://dx.doi.org/10.1007/s00190-005-0449-y.

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Guimarães, Gabriel Do Nascimento, Ana Cristina Oliveira Cancoro De Matos, and Denizar Blitzkow. "GRAVIMETRIC DENSIFICATION IN THE STATE OF SÃO PAULO AIMING A GEOID MODEL." Revista Brasileira de Geofísica 31, no. 4 (2013): 631. http://dx.doi.org/10.22564/rbgf.v31i4.343.

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ABSTRACT. Gravitydata coverage is quite complete in São Paulo state for a 5’ resolution. In addition, field works have been conducted to fill in gaps around the state. These efforts are the results of the Fundac¸˜ao de Amparo `a Pesquisa do Estado de S˜ao Paulo (FAPESP) Thematic Project that seeks to achieve the establishment of a geoid model, a height system, and the study of mean sea level. This paper presents a comparison between two geoidal height models; the first with information available up to 2008 (beginning of the project) and the second including all data collected. Both models have

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Tukka, A. A., H. Tata, and O. T. Idowu. "A Computational Tool for Local Gravimetric Geoid Determination Using Least Squares Collocation." Journal of Spatial Information Sciences 2, no. 1 (2025): 251–74. https://doi.org/10.5281/zenodo.14961951.

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<em>This study presents a computational tool (TUIDOTA), for determining local gravimetric geoids using Least Squares Collocation (LSC) techniques, essential for geodetic applications. The geoid provides a reference surface for determining the height of the earth's surface. The study focuses on evaluating the potential of the tool within Akure South Local Government Area in Ondo State of Nigeria, representing mountainous terrains. High-quality terrestrial gravity data, geopotential, and digital elevation models were used. The developed tool facilitates the selection between SLSC and NSLSC, maki

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Abdalla, A., and R. Tenzer. "Compilation of the regional quasigeoid model for New Zealand using the discretised integral-equation approach." Journal of Geodetic Science 2, no. 3 (2012): 206–15. http://dx.doi.org/10.2478/v10156-011-0041-8.

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AbstractWe evaluate the new regional quasigeoid model (OTG12) for New Zealand using the method which utilises the discretised integral equation approach for computing the near-zone contribution. The far-zone contribution is computed by modified spherical harmonics of the geopotential. Adopting the remove-compute-restore computation scheme, the near- and far-zone contributions are computed for the residual height anomalies, while the reference height anomalies are evaluated using a global gravitational model. For the numerical realisation, the GOCO-02S coefficients complete to degree 55 of sphe

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Tata, Herbert, and S. O. Eteje. "Determination of Orthometric Heights of Points Using Gravimetric/GPS and Geodetic Levelling Approaches." INDIAN JOURNAL OF ENGINEERING 18, no. 49 (2021): 134–44. https://doi.org/10.5281/zenodo.4764951.

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The importance of practical, as well as orthometric heights in engineering cannot be underestimated as it is required for the determination of proposed construction levels and to direct the flow of water. This study presents the determination of orthometric heights of points using gravimetric/GPS and geodetic levelling approaches and compares the resolution of the two approaches to determine which of the methods is better for orthometric height determination in the study area. A total of 59 stations were occupy for gravity observation using Lacoste and Romberg (G-512 series) gravimeter to obta

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Lyszkowicz, Adam, Jolanta Nastula, Janusz B. Zielinski, and Monika Birylo. "A New Model of Quasigeoid for the Baltic Sea Area." Remote Sensing 13, no. 13 (2021): 2580. http://dx.doi.org/10.3390/rs13132580.

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The Space Research Centre in Warsaw is participating in the ESA project “Geodetic SAR for Height System Unification and Sea Level Research”. To observe the absolute sea level and enable the unification of the height systems, the physical heights of the tide gauge stations referring to a common equipotential surface (quasigeoid/geoid) are needed. This paper describes the new quasigeoid model for the area of the Baltic sea. The quasigeoid calculation was carried out according to the Helmert method, in which the topography is condensed on a layer lying on the geoid. Airborne gravity anomalies fro

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Sari, D. N. I., A. M. Shodiq, U. Syauqi, M. S. Fathulhuda, and M. T. Novianto. "Analysis of Determining Geoid Height Values in Urban Areas." IOP Conference Series: Earth and Environmental Science 1276, no. 1 (2023): 012011. http://dx.doi.org/10.1088/1755-1315/1276/1/012011.

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Abstract Floods have a significant impact on human life. To reduce the risk due to flooding, mitigation is needed. Mitigation can be done when information about the flood model has been mapped. Flood modeling requires primary data in height values with reasonable accuracy. The essential data can be obtained through INAGEOID2020. INAGEOID2020 cannot be used optimally due to a lack of information regarding its accuracy. The validation process has been carried out on 5 (five) significant islands. One is the island of Borneo, which focuses on the Kalimantan Barat and Kalimantan Timur Provinces. In

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Vergos, Georgios S., Ilias N. Tziavos, Stelios Mertikas, Dimitrios Piretzidis, Xenofon Frantzis, and Craig Donlon. "Local Gravity and Geoid Improvements around the Gavdos Satellite Altimetry Cal/Val Site." Remote Sensing 16, no. 17 (2024): 3243. http://dx.doi.org/10.3390/rs16173243.

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The isle of Gavdos, and its wider area, is one of the few places worldwide where the calibration and validation of altimetric satellites has been carried out during the last, more than, two decades using dedicated techniques at sea and on land. The sea-surface calibration employed for the determination of the bias in the satellite altimeter’s sea-surface height relies on the use of a gravimetric geoid in collocation with data from tide gauges, permanent global navigation satellite system (GNSS) receivers, as well as meteorological and oceanographic sensors. Hence, a high-accuracy and high-reso

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Naod, Sofija. "The significance of determination of the absolute value of gravity in geodesy." Tehnika 76, no. 1 (2021): 17–24. http://dx.doi.org/10.5937/tehnika2101017n.

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The gravity is used to solve geodesy's primary tasks, such as determining geoid and defining the height and gravimetric reference networks of different scales, from national to global. Knowledge of gravity is of great importance for both metrology and geodetic metrology. In addition to the historical overview of absolute gravimeters, this paper presents the theoretical basis of the most commonly used method for determining the absolute value of gravity. The principle of operation of the absolute gravimeter FG5 and the importance of international comparison of absolute gravimeters are briefly p

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Foroughi, Ismael, Abdolreza Safari, Pavel Novák, and Marcelo Santos. "Application of Radial Basis Functions for Height Datum Unification." Geosciences 8, no. 10 (2018): 369. http://dx.doi.org/10.3390/geosciences8100369.

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Local gravity field modelling demands high-quality gravity data as well as an appropriate mathematical model. Particularly in coastal areas, there may be different types of gravity observations available, for instance, terrestrial, aerial, marine gravity, and satellite altimetry data. Thus, it is important to develop a proper tool to merge the different data types for local gravity field modelling and determination of the geoid. In this study, radial basis functions, as a commonly useful tool for gravity data integration, are employed to model the gravity potential field of the southern part o

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Moussa, Hiba, and Mohammad Abboud. "Methodology of Applying Inverse Distance Weighting Interpolation Method in Determining Normal Heights." Resourceedings 4, no. 1 (2024): 01–06. http://dx.doi.org/10.21625/resourceedings.v4i1.1068.

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This article explores the application of the Inverse Distance Weighting (IDW) interpolation method in determining normal heights, utilizing a network of points with measured ellipsoidal and normal heights by the use of GNSS/levelling method. The IDW method, which assumes that points closer to each other are more alike, is employed to locate points within the correct quadrant and calculate their normal height based on the determined average height anomaly across the entire area. The accuracy of this method is validated using check points. The article further discusses the methodology of normal

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Goyal, Ropesh, and Onkar Dikshit. "National Geospatial Policy: Perspectives on Height Systems, Vertical Datums and Gravimetric Geoid Modelling in India." Current Science 126, no. 3 (2024): 309. https://doi.org/10.18520/cs/v126/i3/309-319.

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Tata, H., and M. B. Ganiyu. "Determination of the Deflection of the Vertical Using a Gravimetric Approach within the Federal University of Technology Akure, Nigeria." Journal of Spatial Information Sciences 2, no. 1 (2025): 93–111. https://doi.org/10.5281/zenodo.14811174.

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Deflection of the vertical is the angle between the true vertical (the direction of gravity) at a point on the Earth's surface and the normal to the reference ellipsoid (the idealized mathematical model of the Earth's shape). It arises due to the Earth's irregular mass distribution, which causes local variations in the direction of gravity. This research investigates the deflection of the vertical at the Federal University of Technology Akure using a gravimetric approach to determine geoidal undulation. Gravity data from 44 geodetic control stations were observed. The geoidal height and deflec

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El-Diasty, Mohammed, Mosbeh R. Kaloop, and Faisal Alsaaq. "Chart Datum-to-Ellipsoid Separation Model Development for Obhur Creek Using Multibeam Hydrographic Surveying." Journal of Marine Science and Engineering 10, no. 2 (2022): 264. http://dx.doi.org/10.3390/jmse10020264.

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A traditional shore-based discrete point chart datum (CD) that represents the lowest astronomical tide (LAT) in Saudi Arabia using tide gauge data is utilized to reduce the observed depth collected from hydrographic surveying test to CD-referenced depth for producing navigation charts for maritime navigation applications. A need for developing CD in a continuous form is essential to replace the traditional discrete CD using tide gauge data. The importance of the development of CD-to-ellipsoid (WGS84) separation model is that it can be utilized by the hydrographers to develop an accurate vertic

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Borghi, Alessandra, Riccardo Barzaghi, Omar Al-Bayari, and Suhail Al Madani. "Centimeter Precision Geoid Model for Jeddah Region (Saudi Arabia)." Remote Sensing 12, no. 12 (2020): 2066. http://dx.doi.org/10.3390/rs12122066.

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In 2014, the Jeddah Municipality made a call for an estimate of a centimetric precision geoid model to be used for engineering and surveying applications, because the regional geoid model available at that time did not reach a sufficient precision. A project was set up to this end and dedicated sets of gravity and Global Positioning System (GPS)/levelling data were acquired in the framework of this project. In this paper, a thorough analysis of these newly acquired data and of the last available Global Gravity Field Models (GGMs) has been done in order to obtain a geoid undulation estimate wit

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Kiamehr, R. "A new height datum for Iran based on the combination of gravimetric and geometric geoid models." Acta Geodaetica et Geophysica Hungarica 42, no. 1 (2007): 69–81. http://dx.doi.org/10.1556/ageod.42.2007.1.4.

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Featherstone, W. E. "Absolute and relative testing of gravimetric geoid models using Global Positioning System and orthometric height data." Computers & Geosciences 27, no. 7 (2001): 807–14. http://dx.doi.org/10.1016/s0098-3004(00)00169-2.

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Kiliçoğlu, Ali, Ahmet Direnç, Hasan Yildiz, et al. "Regional gravimetric quasi-geoid model and transformation surface to national height system for Turkey (THG-09)." Studia Geophysica et Geodaetica 55, no. 4 (2011): 557–78. http://dx.doi.org/10.1007/s11200-010-9023-z.

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Featherstone, Will. "Do we need a Gravimetric Geoid or a Model of the Australian Height Datum to Transform GPS Heights in Australia?" Australian Surveyor 43, no. 4 (1998): 273–80. http://dx.doi.org/10.1080/00050350.1998.10558758.

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Amin, Hadi, Lars E. Sjöberg, and Mohammad Bagherbandi. "A global vertical datum defined by the conventional geoid potential and the Earth ellipsoid parameters." Journal of Geodesy 93, no. 10 (2019): 1943–61. http://dx.doi.org/10.1007/s00190-019-01293-3.

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Abstract The geoid, according to the classical Gauss–Listing definition, is, among infinite equipotential surfaces of the Earth’s gravity field, the equipotential surface that in a least squares sense best fits the undisturbed mean sea level. This equipotential surface, except for its zero-degree harmonic, can be characterized using the Earth’s global gravity models (GGM). Although, nowadays, satellite altimetry technique provides the absolute geoid height over oceans that can be used to calibrate the unknown zero-degree harmonic of the gravimetric geoid models, this technique cannot be utiliz

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Cob, Sanusi, Majid Kadir, Rene Forsberg, et al. "Epoch-Based Height Reference System for Sea Level Rise Impact Assessment on the Coast of Peninsular Malaysia." Remote Sensing 14, no. 23 (2022): 6179. http://dx.doi.org/10.3390/rs14236179.

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The Peninsular Malaysia Geodetic Vertical Datum 2000 (PMGVD2000) inherited several deficiencies due to offsets between local datums used, levelling error propagations, land subsidence, sea level rise, and sea level slopes along the southern half of the Malacca Strait on the west coast and the South China Sea in the east coast of the Peninsular relative to the Port Klang (PTK) datum point. To cater for a more reliable elevation-based assessment of both sea level rise and coastal flooding exposure, a new epoch-based height reference system PMGVD2022 has been developed. We have undertaken the pro

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Fuseau, David, Lucia Seoane, Guillaume Ramillien, et al. "Efficiency of Optimized Approaches for Gravity Operator Modeling." Remote Sensing 16, no. 21 (2024): 4031. http://dx.doi.org/10.3390/rs16214031.

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Numerical tesseroid and radial-type approaches are presented and compared in terms of their efficiency for deriving the regional geoid height, vertical gravity, and gradiometric anomalies from sea floor topography grids. The vertical gradient function is particularly suitable for representing shorter wavelengths of gravity, typically less than 10 km. These two modeling methods were applied to the Great Meteor guyot in the Atlantic Ocean using its bathymetry. To optimize the computation of high-resolution gravity anomalies, the Armadillo, GSL, and OpenMP libraries were used to provide an enviro

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Deng, Xingsheng, Xianghong Hua, and Yangsheng You. "Transfer of height datum across seas using GPS leveling, gravimetric geoid and corrections based on a polynomial surface." Computers & Geosciences 51 (February 2013): 135–42. http://dx.doi.org/10.1016/j.cageo.2012.07.033.

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Hayden, T., E. Rangelova, M. G. Sideris, and M. Véronneau. "Evaluation of W0 in Canada using tide gauges and GOCE gravity field models." Journal of Geodetic Science 2, no. 4 (2012): 290–301. http://dx.doi.org/10.2478/v10156-012-0003-9.

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AbstractThe existing Canadian Geodetic Vertical Datum of 1928 (CGVD28) does not meet the needs of the modern user in terms of accuracy and accessibility. As a result, Canada plans to implement a geoid-based and global navigation satellite system (GNSS)-accessible vertical datum by 2013. One of the primary concerns in realizing this new vertical datum is to determine a W0 value that will represent the potential of the zero height surface. The objective of this study is to evaluate W0 by averaging the potential of points on the mean sea water surface utilizing tide gauge recordings and gravity f

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Silva, Valéria Cristina, Denizar Blitzkow, Flávio Guilherme Vaz Almeida, Ana Cristina Oliveira Cancoro Matos, and Gabriel do Nascimento Guimarães. "Computation and Analysis of Geopotential Number in São Paulo, Brazil." Earth Sciences Research Journal 26, no. 2 (2022): 107–18. http://dx.doi.org/10.15446/esrj.v26n2.100645.

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In recent decades, important steps have been taken to implement the physical concepts of Geodesy in practice, con- cerning height systems. Despite the difficulties involving gravity field modeling, with the establishment of conventions, standards, and computation strategies, the realization of the International Height Reference System (IHRS) is well underway. For a global system, there are constraints for some countries, especially for those with sparse gravity data, mountain regions, and vast areas. In terms of methodology, the computation can be performed directly using the Global Geopotenti

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Mahbuby, Hany, Yazdan Amerian, Amirhossein Nikoofard, and Mehdi Eshagh. "Application of the nonlinear optimisation in regional gravity field modelling using spherical radial base functions." Studia Geophysica et Geodaetica 65, no. 3-4 (2021): 261–90. http://dx.doi.org/10.1007/s11200-020-1077-y.

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AbstractThe gravity field is a signature of the mass distribution and interior structure of the Earth, in addition to all its geodetic applications especially geoid determination and vertical datum unification. Determination of a regional gravity field model is an important subject and needs to be investigated and developed. Here, the spherical radial basis functions (SBFs) are applied in two scenarios for this purpose: interpolating the gravity anomalies and solving the fundamental equation of physical geodesy for geoid or disturbing potential determination, which has the possibility of being

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Zhang, Shengjun, Runsheng Zhou, Yongjun Jia, Taoyong Jin, and Xiangxue Kong. "Performance of HaiYang-2 Altimetric Data in Marine Gravity Research and a New Global Marine Gravity Model NSOAS22." Remote Sensing 14, no. 17 (2022): 4322. http://dx.doi.org/10.3390/rs14174322.

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Haiyang-2 (HY-2) missions have accumulated sea surface height (SSH) observations on a global scale for more than 10 years. Four satellites, HY-2A, HY-2B, HY-2C and HY-2D, provide even but differently distributed data, which play a complementary role in marine gravity studies with other missions. Therefore, this paper evaluates the performances of HY-2 altimetric data in marine gravity modeling from the following four perspectives: SSH accuracy, geoid signal resolution ability, vertical deflections and gravity anomaly. First, the centimeter-magnitude accuracy level of HY-2 data is proved by ana

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Isik, Mustafa Serkan, Muhammed Raşit Çevikalp, Bihter Erol, and Serdar Erol. "Improvement of GOCE-Based Global Geopotential Models for Gravimetric Geoid Modeling in Turkey." Geosciences 12, no. 12 (2022): 432. http://dx.doi.org/10.3390/geosciences12120432.

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This study investigates the contribution of global geopotential models which are calculated with GOCE satellite mission data to the improvement of gravimetric geoid models in Turkey. In this context, direct (DIR), time-wise (TIM), space-wise (SPW), and GOCO satellite-only model series were considered. The research was carried out in two parts. The first part includes the validation of models in each series at 100 homogeneously distributed GNSS/leveling stations over the country utilizing spectrally enhanced geoid heights to determine the best performing model and its optimal expansion degree.

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Eteje, S. O., O. F. Oduyebo, and M. N. Ono. "Comparison of Three Gravimetric-Geometric Geoid Models for Best Local Geoid Model of Benin City, Nigeria." International Journal of Advanced Engineering Research and Science (IJAERS) 6, no. 12 (2019): 261–72. https://doi.org/10.22161/ijaers.612.23.

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The conversion of geometric as well as ellipsoidal heights from GNSS observations to practical heights for engineering constructions has necessitated the determination of the local geoid model of areas. Benin City is a developing area which requires a local geoid model for conversion of geometric heights to orthometric heights for physical developments in the area. This paper is on the best local geoid model of Benin City, Nigeria by comparing three gravimetric-geometric geoid models of the study area. GNSS and gravimetric observations were carried out on 49 points to respectively obtain their

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