Earthdata login will be performing a 1-hour test on Friday, October 6, between 10:30am – 12pm EDT (14:30 – 16:00 UTC). Logins should not be affected if you have logged into your Earthdata account in the past year. If you have any issues logging in outside of this time period, please send a help request to support-cddis@earthdata.nasa.gov.

Related data and information links
- International GNSS Service (IGS)
- IGS Tracking Stations
- IGS Analysis Centers
- IGS Data Centers
- IGS Analysis Center Coordinator (ACC) web sites
- IGS Real-Time Service (RTS)
- IGS Multi-GNSS Experiment (MGEX), including satellite information
- GNSS system status information
- IGS data and product formats
- RINEX Version 2.11
- RINEX Version 3.03
- NOAA's Continuously Operating Reference Stations (CORS)
- UNAVCO
- GPS Seamless Archive Center (GSAC)
- Russian GLONASS Home Page
- International GLONASS Experiment (IGEX-98)
- Interactive GPS Calendar
- Earth orientation animations
