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DOI	10.1007/s12517-021-07817-6
	Local geoid model of the Western Desert in Egypt using terrestrial gravity data and global geopotential models
	Elwan, Mostafa Ahmed; Helaly, Ahmad; Zharan, Khaled; Issawy, Elsayed; El-Gawad, Ahmed Abd
通讯作者	Elwan, MA (corresponding author), Natl Res Inst Astron & Geophys NRIAG, Geodynam Dept, Cairo 11421, Egypt.
来源期刊	ARABIAN JOURNAL OF GEOSCIENCES
ISSN	1866-7511
EISSN	1866-7538
出版年	2021
卷号	14 期号:15
英文摘要	The local hybrid geoid model for the western desert in Egypt is computed by recent data, including the global geopotential models, gravimetric measurements, and a high-resolution digital topographic model. The research points out the importance of accurate local geoid computation not only as a survey datum but also to figure out the crustal structure. Detailed crustal structure patterns could reveal the origin of artesian aquifers and geothermal activities of the selected region. In this research, recent global geopotential models deduced from recent satellite missions have been used. The oases' area of the western desert in Egypt is characterized by an irregular topographic pattern suggesting a complicated geoid model. Six recent global geopotential models (GGMs) have been evaluated for long and medium wavelengths. GGM accuracy for each model has been computed using GPS leveling data. EIGEN-6C model with spherical harmonic expansion to degree 250 gives the smallest error with a standard deviation equal to 0.019mGal. Also, a high-resolution digital topographic model with 3arcsec is used for terrain correction (Tc). The resulting geoid has been evaluated using GPS leveling in the selected region. Due to the recent geopotential models with high accuracy, the random distribution and low terrestrial gravity data have not become a problem in calculating the local geoid model.
英文关键词	GGM Western Desert Oases Local geoid GPS
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000691864800001
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/362549
作者单位	[Elwan, Mostafa Ahmed; Zharan, Khaled; Issawy, Elsayed] Natl Res Inst Astron & Geophys NRIAG, Geodynam Dept, Cairo 11421, Egypt; [Helaly, Ahmad; El-Gawad, Ahmed Abd] Ain Shams Univ, Fac Sci, Geophys Dept, Cairo, Egypt
推荐引用方式 GB/T 7714	Elwan, Mostafa Ahmed,Helaly, Ahmad,Zharan, Khaled,et al. Local geoid model of the Western Desert in Egypt using terrestrial gravity data and global geopotential models[J],2021,14(15).
APA	Elwan, Mostafa Ahmed,Helaly, Ahmad,Zharan, Khaled,Issawy, Elsayed,&El-Gawad, Ahmed Abd.(2021).Local geoid model of the Western Desert in Egypt using terrestrial gravity data and global geopotential models.ARABIAN JOURNAL OF GEOSCIENCES,14(15).
MLA	Elwan, Mostafa Ahmed,et al."Local geoid model of the Western Desert in Egypt using terrestrial gravity data and global geopotential models".ARABIAN JOURNAL OF GEOSCIENCES 14.15(2021).