Daily 30-second GNSS Observation Data


Data Center Citation

Noll, Carey E., The Crustal Dynamics Data Information System: A resource to support scientific analysis using space geodesy, Advances in Space Research, Volume 45, Issue 12, 15 June 2010, Pages 1421-1440, ISSN 0273-1177, http://dx.doi.org/10.1016/j.asr.2010.01.018.

Data Citation

International GNSS Service, Daily 30-second observation data, Greenbelt, MD, USA:NASA Crustal Dynamics Data Information System (CDDIS), Accessed [[enter user data access date]] at doi:10.5067/GNSS/gnss_daily_o_001.

Other standard citation formats may be used for this data set and can be found at the DOI Citation Formatter website.

More information about CDDIS data citations and acknowledgments is available.


  • Name: Daily 30-second sampled GNSS observation data
  • Format: RINEX V2, UNIX compressed ASCII
  • Spatial Coverage: 90.0 to -90.0, 180.0 to -180.0
  • Temporal Coverage: 1992-01-01 to present
  • Temporal Resolution: Daily
  • File Size: 2.5 Mbytes/site/day
  • Platforms: GPS, GLONASS


GNSS data from a global network of permanent GNSS receivers supporting the International GNSS Service (IGS) operating at a 30-second sampling rate and containing 24 hours of data (00:00-23:59 UTC).

Data Access

The daily 30-second GNSS observation data are online:


in subdirectories by year, day of year, and data type as follows:


Code Meaning
mmmm 4-character site monument name
YYYY4-digit year
YY2-digit year
DDD 3-digit day of year
# sequence number (0, 1, ...) indicating multiple files within a day; typically 0
.Z UNIX compressed file