Gravity corrections for the updated italian levelling network

IF 2.3 Q2 REMOTE SENSING

Applied Geomatics Pub Date : 2023-07-13 DOI:10.1007/s12518-023-00516-9

Riccardo Barzaghi, Daniela Carrion, Marianna Carroccio, Renzo Maseroli, Giacomo Stefanelli, Giovanna Venuti

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引用次数: 1

Abstract

The Italian official height system is defined through a high precision levelling network established and maintained by the Istituto Geografico Militare - IGM. During the last 20 years, IGM has performed levelling campaigns on almost the whole peninsular area of Italy with the aim of both densifying the existing network and updating the reference heights. This paper reports about the procedure applied to correct the levelling observations for the gravity effects and the assessment on the results. The needed gravity values were predicted from the Italian gravity dataset (IGD), and both from EGM2008 and XGM2019e high resolution global gravity models. A new formulation of the normal correction as well as the standard orthometric correction were applied. The IGD derived corrections proved to be effective by reducing the misclosure error of critical loops below the tolerance level. Gravity data derived from EGM2008 and XGM2019e proved to be too poor for the correction purposes, as it was also confirmed by a comparison against available observed data, with RMS of the differences, in Alpine ares, ranging between 50 and 100 mGal.

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更新后的意大利水准网重力校正

意大利官方高度系统是通过由Istituto Geografico Militare-IGM建立和维护的高精度水准测量网络定义的。在过去的20年里，IGM在几乎整个意大利半岛地区开展了调平活动，目的是加密现有网络并更新参考高度。本文报告了用于校正重力效应的水准测量观测值的程序以及对结果的评估。所需的重力值是根据意大利重力数据集（IGD）以及EGM2008和XGM2019e高分辨率全球重力模型预测的。应用了一种新的正态校正公式和标准正交校正公式。IGD导出的修正被证明是有效的，因为它将临界回路的闭合误差降低到了公差水平以下。EGM2008和XGM2019e得出的重力数据被证明太差，无法进行校正，因为与现有观测数据的比较也证实了这一点，阿尔卑斯地区的差异均方根值在50至100 mGal之间。

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

Applied Geomatics REMOTE SENSING-

CiteScore

5.40

自引率

3.70%

发文量

期刊介绍： Applied Geomatics (AGMJ) is the official journal of SIFET the Italian Society of Photogrammetry and Topography and covers all aspects and information on scientific and technical advances in the geomatics sciences. The Journal publishes innovative contributions in geomatics applications ranging from the integration of instruments, methodologies and technologies and their use in the environmental sciences, engineering and other natural sciences. The areas of interest include many research fields such as: remote sensing, close range and videometric photogrammetry, image analysis, digital mapping, land and geographic information systems, geographic information science, integrated geodesy, spatial data analysis, heritage recording; network adjustment and numerical processes. Furthermore, Applied Geomatics is open to articles from all areas of deformation measurements and analysis, structural engineering, mechanical engineering and all trends in earth and planetary survey science and space technology. The Journal also contains notices of conferences and international workshops, industry news, and information on new products. It provides a useful forum for professional and academic scientists involved in geomatics science and technology. Information on Open Research Funding and Support may be found here: https://www.springernature.com/gp/open-research/institutional-agreements