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International Service for the Geoid
The International Service for the Geoid provides geoid data, conversion tools, software downloads, and documentation from its geoid school.
About International Service for the Geoid
The International Service for the Geoid (ISG) is an official service of the International Association of Geodesy (IAG). It was founded in 1992 as the International Geoid Service (IGeS) and works in education, research and data distribution. Its main purposes are collecting and distributing geoid models, collecting and distributing software for geoid computation, and organizing technical schools on geoid determination. The service is run from two centres, one at Politecnico di Milano and one at NGA.
The site offers a geoid repository, a height conversion tool, a software download section, information on geoid schools, and the Newton's Bulletin publication. ISG also reports taking part in the European Gravity Geoid Project, the GOCE satellite mission, and the Global Geodetic Observing System (GGOS) height datum work. The site states that neither ISG nor its staff accept liability for use of the data and models, and gives no warranty of fitness, completeness, usefulness or accuracy for any purpose.
Key features
- Geoid repository collecting geoid data on a worldwide scale
- Height conversion tool
- Software download for geoid determination and computation
- Geoid schools providing technical training on geoid determination
- Newton's Bulletin, edited and distributed by the service
- Participation in the European Gravity Geoid Project, GOCE mission and GGOS
Best for: Geodesists, gravity field researchers and students who need geoid models, geoid computation software or training in geoid determination.
Good for
- Operated as an official service of the International Association of Geodesy
- Combines geoid data, computation software and training in one site
- Gives a formal citation to use when referencing the service and its models
Watch out for
- Neither ISG nor its staff accept liability for use of the data and models
- No warranty of fitness, completeness, usefulness or accuracy for any intended purpose
International Service for the Geoid at a glance
- Website
- isgeoid.polimi.it
- Category
- Research & Data › Open Data & Datasets
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- Web
- Open source
- Not stated
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
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International Service for the Geoid FAQ
Does the service accept liability for the data and models?
No. The site states that neither ISG nor any of its staff accept liability in connection with the use of the data and models, and make no warranty of their fitness, completeness, usefulness or accuracy for any intended or unintended purpose.
How should the service be cited?
The site asks users to cite it as: M. Reguzzoni, D. Carrion, C.I. De Gaetani, A. Albertella, L. Rossi, G. Sona, K. Batsukh, J.F. Toro Herrera, K. Elger, R. Barzaghi, F. Sansó (2021). Open access to regional geoid models: the International Service for the Geoid. Earth System Science Data, 13, pp. 1653–1666. DOI: 10.5194/essd-13-1653-2021.
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