International Earth Rotation and Reference Systems Service
- http://www.iers.org/
- IERS provides data, publications and general information on the Earth`s orientation, the International Celestial Reference Frame (ICRF) and the International Terrestrial Reference Frame (ITRF), as well as geophysical data and conventions.
Unidata Internet Data Distribution (IDD)
- http://www.unidata.ucar.edu/software/idd/
- Community of over 130 universities building a system for disseminating near real-time earth observations via the Internet. The system is designed so that a university can request that certain data sets be delivered to their computers as soon as they are available from the observing system.