Possibility to determine highly precise geoid for Egypt territory

Gad, Moamen Awad Habib (author), Odalovic, Oleg (author), Naod, Sofija (author)

This paper presents an attempt to consider whether it is possible to determine a geoid at the centimetre level in the territory of Egypt based on recently available global and local gravity field data. The paper has two main objectives. Firstly, the paper overviews previously published geoid solutions, while the second objective investigates the performance of the recent global geopotential models (GGM) in Egypt. The existing geoid solutions have illustrated that there is an insufficient distribution of data which is sampled inconsistently. At this time, data deficiency still exists, and to overcome it, we have selected a "data window" and applied the Least Square Collocation (LSC) technique. The outcome from LSC was interesting and acceptable, and we obtained a "sample" geoid that has a standard deviation of 11 cm for the external control points.

• Language: English
• Keywords: geoid, gepotential model, GGMs, GPS, collocation, LSC, Egypt geoid, Egypt
• Work type: Scientific work
• Typology: 1.01 - Original Scientific Article
• Organization: FGG - Faculty of Civil and Geodetic Engineering
• Publication status: Published
• Publication version: Version of Record
• Article acceptance date: 15.09.2020
• Publication date: 08.12.2020
• Year: 2020
• Number of pages: Str. 578-593
• Numbering: Letn. 64, št. 4
• PID: 20.500.12556/RUL-132795
• UDC: 528.21(620)528.28
• ISSN on article: 0351-0271
• DOI: 10.15292/geodetski-vestnik.2020.04.578-593
• COBISS.SI-ID: 45277443
• Publication date in RUL: 03.11.2021

Record is a part of a journal

• Title: Geodetski vestnik. glasilo Zveze geodetov Slovenije
• Shortened title: Geod. vestn.
• Publisher: Zveza geodetov Slovenije
• ISSN: 0351-0271
• COBISS.SI-ID: 5091842

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
• Licensing start date: 08.12.2020

Secondary language

• Language: Slovenian
• Title: Možnost določitve visoko natančnega geoida za ozemlje Egipta

Abstract

V članku predstavljamo rezultate študije, s katero smo preverjali, ali je mogoče na temelju dosegljivih globalnih in lokalnih podatkov o težnostnem polju določiti geoid z nekajcentimetrsko natančnostjo za ozemlje Egipta. Pri tem smo si zastavili dva cilja. Najprej podajamo pregled objav na temo izračuna geoida, sledi predstavitev aktualnih globalnih geopoetencialnih modelov (GGM) za območje Egipta. Analiza obstoječih modelov geoida v Egiptu je pokazala, da so izračunani na temelju neustrezne porazdelitve podatkov z nekonsistentnim vzorčenjem. Tudi danes za območje Egipta ni dovolj podatkov za izračun geoida. Za rešitev težave smo izbrali pristop podatkovnega okna ter uporabili tehniko kolokacije po metodi najmanjših kvadratov (angl. least square collocation % LSC). Rezultati so zanimivi in sprejemljivi, saj znaša standardna deviacija za odstopanja izračunanega geoida od vrednosti na kontrolnih točkah 11 centimetrov.

• Keywords: geoid, geopotencialni model, GGM, kolokacija, LSC, geoid Egipta, Egipt