Evaluating two numerical methods for developing a local geoid model and a local digital elevation model for the Red Sea Coast, Egypt

Ahmed, Hamdy M.; Elshewy, Mohamed; Bahaa, Shaheen A.

doi:10.1016/j.jksues.2021.04.004

Cited by 5 publications

(2 citation statements)

References 16 publications

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“…Качество построения ЦМР как источника точной геопространственной информации [27][28][29] в том числе c исправлением высот по локальным моделям геоидов [30], напрямую зависит от его выбора [31][32][33]. Авторы работ [34][35][36] отмечают целесообразность применения следующих методов пространственной интерполяции для построения ЦМР [37][38][39]:…”

Section: Introductionunclassified

Determination procedure of linear parameters of movement processes from digital terrain models in Khibiny apatite–nepheline ore mining

Zherlygina,

Mustafin,

Vasiliev

et al. 2023

gzh

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Surveying of ground and underground movements aims to determine and adjust the displacement parameters, and the type and size of deformation of undermined objects. The authors describe application of digital terrain models to assess movement process parameters as a case-study of Khibiny apatite-nepheline ore mining. The possibility to determine linear parameters of movements in the ground surface area inaccessible using classical methods is illustrated. The source information was the aerial laser scanning data obtained in 2015 to 2020 in Rasvumchorr and Kukisvumchorr Mines. The data were classified using TerraSolid TerraScan tools. Then, the digital terrain models were constructed in Microstation. The further digital modeling of the terrain was carried out in Golden Software's Surfer with spatial resolution and some spatial interpolation techniques. Using the resultant digital models, the surfaces were constructed in Autodesk AutoCAD. The surfaces were used to draw cross-sections in the coordinate grid in Rhinoceros 6. Over the observation period from 2015 to 2020, by the authors' opinion, the method of kriging proved to be the best out of the methods tested in Rasvumchorr and Kukisvumchorr Mines. The method of spatial interpolation provided the least scatter of data, the lowest minimum and maximum deviations and the least mean square deviation in the majority of tests. The research findings allow expecting that the described methods can enable safe mining at the minimum time consumption.

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Section: Introductionunclassified

Determination procedure of linear parameters of movement processes from digital terrain models in Khibiny apatite–nepheline ore mining

Zherlygina,

Mustafin,

Vasiliev

et al. 2023

gzh

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“…Compared to the first-generation global gravity field models derived, it is now possible to represent the Earth's global gravity field and its variations with better spatial and temporal resolutions using the highly accurate satellite measurements. Many studies in Egypt were conducted to evaluate the GGMs by different approaches, such as: [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Assessing the Accuracy of the Geoid Heights Calculated by Interpolation and Extrapolation From Global Geoid Models in Northern Egypt

Ibrahim

Elshewy

2022

Journal of Al-Azhar University Engineering Sector

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Global Geoid Models (GGMs) have an important role in height transformation to convert the ellipsoidal height into orthometric height in several engineering applications. Based on recent research findings, and by pre-assessment of five GGMs; namely EGM2008, EIGEN-6C4, GECO, SGG-UGM-1, and XGM2019e_2159, it was found that the global models XGM2019e_2159 and GECO showed promising results by comparing against 165 GNSS/Level control points in the north of Egypt. In light of the above, the geoid heights calculated from the XGM2019e_2159 and GECO using interpolation and extrapolation methods have been assessed in this region. For each GGM, Geoid heights have been computed and, then, compared with the known control points. In the interpolation part, statistical analysis has been performed with accomplished results indicating that, the errors were about 0.04 m and 0.05 m in the Mediterranean coast and for the Nile River in the delta area were about 0.06 m and 0.05 m, respectively. In the region of Northern Egypt, the leveling of the 3rd class could be replaced by the XGM2019e_2159 or GECO model after aligning it with the control points every 50 km by interpolation approach. On the other approach, the geoid height for a distance of 25 km can be obtained from the global models XGM2019e_2159 and GECO using the extrapolation method with an error of 0.08 m. In order to improve the results obtained by the extrapolation method, Artificial Neural Network (ANN) has been used to create a local geoid in the area of the Mediterranean coast and evaluated over the Delta region. The results showed small error values of about 0.04 m and 0.05 m in the first 50 km using XGM2019e_2159 and GECO.

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Elaboration of a Quasi-Geoid Height Model for the Construction of Linear Structures

Bryn,

Bashirova,

Bushuev

2024

Lecture Notes in Networks and Systems

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Evaluating two numerical methods for developing a local geoid model and a local digital elevation model for the Red Sea Coast, Egypt

Cited by 5 publications

References 16 publications

Determination procedure of linear parameters of movement processes from digital terrain models in Khibiny apatite–nepheline ore mining

Determination procedure of linear parameters of movement processes from digital terrain models in Khibiny apatite–nepheline ore mining

Assessing the Accuracy of the Geoid Heights Calculated by Interpolation and Extrapolation From Global Geoid Models in Northern Egypt

Elaboration of a Quasi-Geoid Height Model for the Construction of Linear Structures

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