Refinement of the Kuwait geoid using the modified Stokes' kernel and Airy-Heiskanen isostatic reduction for GIS and geomatics applications

IF 4.3 3区材料科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC ACS Applied Electronic Materials Pub Date : 2023-08-01 DOI:10.1016/j.ejrs.2023.05.001

Ahmed Zaki , Hamad Al-Ajami , Mostafa Rabah , Ahmed Saber , Mohamed El-Ashquer

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Abstract

Orthometric heights are important for various applications such as GIS, geomatics, engineering, and geoscience. The ellipsoidal heights can be computed by Global Navigation Satellite System (GNSS) as an accurate, rapid, and efficient method for height determination. The accurate geoid is essential to convert the ellipsoidal heights from GNSS to orthometric heights. The research developed a new geoid called “KW-FWGM2022″ specifically for Kuwait. We used a composite global geopotential model from SPW R5 with EGM2008 and the digital elevation model from SRTM1. The Wong and Gore modified with Airy-Heiskanen topographic-isotactic reduction were used to compute the geoid model. To assess the accuracy of the KW-FWGM2022 geoid, GNSS/leveling stations were used and the assessment showed that the model's accuracy was better than 1.8 cm as a standard deviation. This demonstrates that the KW-FWGM2022 geoid model is highly accurate and suitable for use in various GIS and Geomatics applications in Kuwait.

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使用修正的Stokes核和Airy-Heiskanen均衡简化对科威特大地水准面进行精化，用于GIS和地学应用

正交高度在地理信息系统、地学、工程和地球科学等各种应用中都很重要。椭球高度可以由全球导航卫星系统（GNSS）计算，作为一种准确、快速和有效的高度确定方法。精确的大地水准面对于将全球导航卫星系统的椭球高度转换为正射高度至关重要。该研究专门为科威特开发了一个名为“KW-FWGM2022”的新大地水准面。我们使用了SPW R5与EGM2008的复合全球位势模型和SRTM1的数字高程模型。采用Airy-Heiskanen地形等规归约修正的Wong和Gore方法计算大地水准面模型。为了评估KW-FWGM2022大地水准面的精度，使用了GNSS/水准测量站，评估表明，作为标准偏差，该模型的精度优于1.8cm。这表明KW-FWGM2022大地水准面模型高度准确，适用于科威特的各种GIS和地球信息学应用。

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