A methodology for transformation between geodetic datums used in Syria

Q1 Chemical Engineering
Al-Kasem Shaza, Ramadan A. Al-Razzak, Jibrini Hasan
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引用次数: 0

Abstract

The Global Navigation Satellite System (GNSS) provides geodetic coordinates referenced to the world ellipsoid WGS84, whereas positions are computed on the local ellipsoid adopted for geodetic computation in various countries. Thus, to take advantage of GNSS in geodetic applications, the need arises to transform coordinates from the global ellipsoid to the local ellipsoid. This is usually carried out by applying geometric transformation models to convert coordinates from The Global Geodetic System WGS84 into the local systems used in each country of the world and into the grid coordinates of local systems. Over the past years, with the increase in the utilization of GNSS in several geodetic projects, numerous methodologies are available for the solution of transformation issues. These methods can be classified into three categories, the first is based on direct mathematical formulas, the second on iteration approaches, and the last category depends on direct transformation from the global system to the local system based on the calculation of transformation parameters (three, seven, nine …etc.). In this study, a methodology has been proposed for direct transformation from global geodetic coordinates to local geodetic coordinates for a limited area in Syria. It is based on the properties of the ratio and proportion between the geometric elements of points on global and local ellipsoids without the calculation of transformation parameters. The results are compared with some studied methods (Bursa-Wolf, Molodensky Abridge, and Cassini). The resulting accuracy is about ± 3.5 cm. The main conclusion drawn is that the proposed method provides a promising alternative approach in coordinates transformation. Therefore, the capability of the suggested methodology as a powerful method for converting geodetic coordinates from one referenced frame to another has been demonstrated in this present study.

叙利亚使用的大地基准之间的转换方法
全球导航卫星系统(GNSS)提供以世界椭球面 WGS84 为参照的大地坐标,而位置是根据各国大地测量所采用的地方椭球面计算的。因此,要在大地测量应用中利用全球导航卫星系统,就需要将坐标从全球椭球面转换到地方椭球面。通常的做法是应用几何转换模型,将坐标从全球大地测量系统 WGS84 转换为世界各国使用的地方系统,并转换为地方系统的网格坐标。在过去几年中,随着全球导航卫星系统在一些大地测量项目中的使用增加,出现了许多解决转换问题的方法。这些方法可分为三类,第一类基于直接数学公式,第二类基于迭代方法,最后一类取决于根据变换参数(三、七、九......等)计算从全球系统到本地系统的直接变换。本研究提出了一种方法,用于将叙利亚有限区域内的全球大地坐标直接转换为当地大地坐标。该方法基于全球椭球和地方椭球上点的几何元素之间的比率和比例特性,无需计算转换参数。结果与一些已研究过的方法(布尔萨-沃尔夫法、莫洛登斯基阿布里奇法和卡西尼法)进行了比较。结果精度约为± 3.5 厘米。得出的主要结论是,建议的方法为坐标转换提供了一种有前途的替代方法。因此,本研究证明了所建议的方法是将大地坐标从一个参照系转换到另一个参照系的有效方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of King Saud University, Engineering Sciences
Journal of King Saud University, Engineering Sciences Chemical Engineering-Fluid Flow and Transfer Processes
CiteScore
12.10
自引率
0.00%
发文量
87
审稿时长
63 days
期刊介绍: Journal of King Saud University - Engineering Sciences (JKSUES) is a peer-reviewed journal published quarterly. It is hosted and published by Elsevier B.V. on behalf of King Saud University. JKSUES is devoted to a wide range of sub-fields in the Engineering Sciences and JKSUES welcome articles of interdisciplinary nature.
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