| isaust.org.au | The Institution of Surveyors, Australia |
| iers.org | International Earth Rotation And Reference Systems Service (iers) |
| iugg.org | International Union of Geodesy and Geophysics (IUGG) |
| isprs.org | Isprs - International Society For Photogrammetry And Remote Sensing |
| icaci.org | International Cartographic Association |
| iavcei.org | IAVCEI |
| iaspei.org | IASPEI - International Association of Seismology and Physics of the Earth's |
| fig.net | FIG Tree International Federation of Surveyors |
| agu.org | American Geophysical Union |
| nasa.gov | Igs -- International Gps Service |
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