On 31 October 2020, anonymous ftp access will officially be discontinued at CDDIS. Beginning July 1, 2020, CDDIS will bandwidth limit ALL IPs using anonymous ftp to just 1MB/s transfer rates. CDDIS is STRONGLY recommending all users begin to transition to using alternate method of access to the CDDIS archive. Examples of alternate methods can be found at: https://cddis.nasa.gov/Data_and_Derived_Products/CDDIS_Archive_Access.html.

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GNSS Final Cumulative Combined Set of Station Coordinates Product

doi: 10.5067/GNSS/gnss_igscssc_001

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, GNSS Final Cumulative Combined Set of Station Coordinates Product, Greenbelt, MD, USA:NASA Crustal Dynamics Data Information System (CDDIS), Accessed [[enter user data access date]] at doi: 10.5067/GNSS/gnss_igscssc_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.

Summary

  • Name: GNSS Final Cumulative Combined Set of Station Coordinates Product available from the Crustal Dynamics Data Information System (CDDIS)
  • Format: Text, UNIX compressed ASCII
  • Spatial Coverage: 90.0 to -90.0, 180.0 to -180.0
  • Temporal Coverage: 1992-01-01 to present
  • Temporal Resolution: Weekly
  • File Size: 120 Kbytes/week
  • Platforms: GPS, GLONASS

Description

The IGS station position/velocity are the basis for the IGS reference frame and are intended for those applications demanding high consistency and quality.

This derived product set consists of Global Navigation Satellite System Final Cumulative Station Positions/Velocities (no covariance matrix) Product available from the Crustal Dynamics Data Information System (CDDIS). GNSS satellites provide autonomous geo-spatial positioning with global coverage. GNSS data sets from ground receivers at the CDDIS consist primarily of the data from the U.S. Global Positioning System (GPS) and the Russian GLObal NAvigation Satellite System (GLONASS). Since 2011, the CDDIS GNSS archive includes data from other GNSS (Europe’s Galileo, China’s Beidou, Japan’s Quasi-Zenith Satellite System/QZSS, the Indian Regional Navigation Satellite System/IRNSS, and worldwide Satellite Based Augmentation Systems/SBASs), which are similar to the U.S. GPS in terms of the satellite constellation, orbits, and signal structure. Analysis Centers (ACs) of the International GNSS Service (IGS) retrieve GNSS data on regular schedules to produce precise orbits identifying the position and velocity of the GNSS satellites as well as precise station positions and velocities for the network of GNSS receivers. The IGS Reference Frame Coordinator uses these individual AC solutions to generate the official IGS station position/velocity product. The final products are considered the most consistent and highest quality IGS solutions and consists of daily and weekly station position and velocity files in SINEX format, generated on a daily/weekly basis by combining solutions from individual IGS ACs, approximately 11-17 days after the end of the solution week.

Data Access

GNSS Final Cumulative Combined Set of Station Coordinates Products (GPS and GPS+GLONASS solutions) are online:

Anonymous ftp service will be discontinued on October 31, 2020.

Append the following directory and file names to the starting directory:

WWWW/igsyyPww.ssc.Z

as described in the table below.

Code Meaning
WWWW GPS week
yy2-digit year
wwweek of year
.Z UNIX compressed file

Documentation

http://cddis.nasa.gov/Data_and_Derived_Products/GNSS/GNSS_data_and_product_archive.html