Geoid Modelling for Surveying Works Using Satellite Geo-Spatial Data

Hasan M. Bilani
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引用次数: 1

Abstract

Positioning is considered as one of the most important problems in civil engineering and surveying works. Today, satellite techniques are widely used for positioning. Global navigation satellite systems provide three-dimensional coordinates (latitude, longitude, and height), related to the reference ellipsoid surface. In most engineering projects, orthometric height related to the geoid is required. separation between ellipsoid and geoid need to be known to convert ellipsoidal height into geoidal height which nearly approximates mean sea level. The ellipsoid is a mathematical surface, while the geoid is a physical one. This leads to problem of modelling the geoid. In this paper, multiple regression method was used to model the geoid in a defined area that resembles a big city. Riyadh city, capital of Saudi Arabia has been used as a case study. It has been found that fifth degree polynomials provide a model with accuracy of 1.8 centimeters.
利用卫星地理空间数据进行测量工程的大地水准面建模
定位是土木工程和测量工作中最重要的问题之一。今天,卫星技术被广泛用于定位。全球导航卫星系统提供与参考椭球面相关的三维坐标(纬度、经度和高度)。在大多数工程项目中,需要与大地水准面相关的正交高度。要将椭球面高度转换为接近平均海平面的大地水准面高度,需要知道椭球面与大地水准面之间的距离。椭球面是一个数学表面,而大地水准面是一个物理表面。这就导致了大地水准面建模的问题。本文采用多元回归方法,在一个类似大城市的确定区域内对大地水准面进行建模。沙特阿拉伯首都利雅得市被用作案例研究。已经发现,五次多项式提供了一个精度为1.8厘米的模型。
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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