Optimally combined regional geoid models for the realization of height systems in de-veloping countries

优化组合区域大地水准面模型以实现发展中国家的高程系统

• 批准号: 315916464
• 负责人: Professor Dr. Roland Pail
• 金额: --
• 依托单位: Deutsches Geodätisches Forschungsinstitut
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/315916464?language=en
• 关键词: Optimally; combined; regional; geoid; models

The definition of physical height systems is one of the main applications of gravity field research. Although globally more than 100 national and regional height systems exist, many developing and newly industrializing countries are lacking any vertical reference frame at all. However, in these countries there is often a rapidly increasing societal and economic need for accurate and easily accessible height information. A significant economic potential lies in the fact that a combination of rather inexpensive GNSS measurements with accurate geoid information (which is called GNSS-levelling) can replace the man-power and cost expensive, laborious task of spirit levelling. The main objective of the project is the formulation of a general scientific concept for the realization and establishment of height systems by GNSS-levelling with emphasis on countries with underdeveloped geodetic infrastructure and low-quality and/or sparse terrestrial data basis. Nowadays, results from the satellite gravity missions GRACE and GOCE enable to determine heights, even in these countries, with a level of accuracy of a few decimeters. This value is mainly due to the spectral limitation of satellite gravity models, resulting in omitted high-frequency gravity signals. Therefore, these satellite-based models have to be combined with complementary terrestrial or airborne data, resulting in regionally enhanced gravity field models as a basis for a height system realization. Innovative methods for an optimal combination of all data required for height system realization, taking the specific boundary conditions of poor or undefined terrestrial data quality, sparse and inhomogeneous data distribution and rough topography into account, shall be developed and enhanced. Furthermore, the main error sources shall be identified and their impact on the final solution shall be analyzed. Based on two numerical case studies (South America, Saudi Arabia), a generalized scientific concept will be derived, including recommendations concerning appropriate data handling, optimized processing techniques and validation procedures. The outcome of the project shall be placed on international level as a significant input to the Global Geodetic Observing System (GGOS), and shall serve as a guideline for further use in science and administration. Therefore, the project will combine fundamental research and methodological development with a practical application of high societal benefit.

物理高度系的确定是重力场研究的主要应用之一。虽然全球有100多个国家和区域高度系统，但许多发展中国家和新兴工业化国家根本没有任何垂直参考框架。然而，在这些国家中，对准确且易于获得的高度信息的社会和经济需求通常迅速增加。一个重要的经济潜力在于，相当廉价的全球导航卫星系统测量与准确的大地水准面信息相结合（称为全球导航卫星系统水准测量）可以取代人力和成本昂贵的费力的水准测量任务。该项目的主要目标是制定通过GNSS水准测量实现和建立高度系统的一般科学概念，重点是大地测量基础设施不发达以及地面数据基础低质量和/或稀疏的国家。如今，GRACE和GOCE卫星重力任务的结果能够确定高度，即使在这些国家，精度也只有几分米。这主要是由于卫星重力模型的频谱限制，导致高频重力信号被遗漏。因此，这些基于卫星的模型必须与补充的地面或空中数据相结合，从而产生区域增强的重力场模型，作为高度系统实现的基础。应制定和加强创新方法，以便最佳地结合实现高度系统所需的所有数据，同时考虑到地面数据质量差或不明确、数据分布稀疏和不均匀以及地形粗糙等具体边界条件。此外，应识别主要误差源，并分析其对最终解决方案的影响。根据两个数值案例研究（南美、沙特阿拉伯），将得出一个普遍的科学概念，包括关于适当数据处理、优化处理技术和验证程序的建议。该项目的成果将在国际一级作为对全球大地测量观测系统的重要投入，并将作为进一步用于科学和管理的准则。因此，该项目将联合收割机的基础研究和方法开发与高社会效益的实际应用相结合。

项目成果

Strategy for the realisation of the International Height Reference System (IHRS)

实现国际高度参考系统（IHRS）的战略

• DOI: 10.1007/s00190-021-01481-0
• 发表时间: 2021
• 期刊: Journal of Geodesy
• 影响因子: 4.4
• 作者: Sánchez;Ågren;Jianliang;Yan Ming;Mäkinen;Jaakko;Roland;Barzaghi;Riccardo;Vergos;Georgios S;Ahlgren
• 通讯作者: Ahlgren

Residual least-squares collocation: use of covariance matrices from high-resolution global geopotential models

残差最小二乘搭配：使用高分辨率全球位势模型的协方差矩阵

• DOI: 10.1007/s00190-019-01279-1
• 发表时间: 2019
• 期刊: Journal of Geodesy
• 影响因子: 4.4
• 作者: Willberg;Martin;Zingerle;Philipp;Roland
• 通讯作者: Roland

Colorado geoid computation experiment: overview and summary

• DOI: 10.1007/s00190-021-01567-9
• 发表时间: 2021-11
• 期刊: Journal of Geodesy
• 影响因子: 4.4
• 作者: Y. M. Wang;Laura Sánchez;J. Ågren;Jianliang Huang;R. Forsberg;H. Abd-Elmotaal;K. Ahlgren;R. Barzaghi;Tomislav Bašić;Daniel Alcaraz Carrion;S. Claessens;B. Erol;S. Erol;M. Filmer;V. Grigoriadis;M. Işık;T. Jiang;Öykü Koç;J. Krcmaric;Xiaopeng Li;Qing Liu;K. Matsuo;Dimitris A. Natsiopoulos;P. Novák;R. Pail;M. Pitoňák;Michael Schmidt;M. Varga;G. Vergos;M. Véronneau;M. Willberg;P. Zingerle

Integration of airborne gravimetry data filtering into residual least-squares collocation: example from the 1 cm geoid experiment

• DOI: 10.1007/s00190-020-01396-2
• 发表时间: 2020-08
• 期刊: Journal of Geodesy
• 影响因子: 4.4
• 作者: M. Willberg;P. Zingerle;R. Pail

Regional gravity field refinement for (quasi-) geoid determination based on spherical radial basis functions in Colorado

• DOI: 10.1007/s00190-020-01431-2
• 发表时间: 2020-10
• 期刊: Journal of Geodesy
• 影响因子: 4.4
• 作者: Qing Liu;M. Schmidt;L. Sánchez;M. Willberg