US Government security requirements no longer permit CDDIS to offer data via traditional unencrypted anonymous ftp; this service was discontinued on October 31, 2020. All data are still available, however access must be via HTTPS or ftp-ssl.
- Gnss Software Download
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- Gnss Solutions software, free download
For information on how C/N 0 is computed within a GNSS receiver, refer to the GNSS Solutions columns by B. Badke (InsideGNSS, September/October 2009) and E. Falletti et alia (January/February 2010). Download this article (PDF).
Instructions with examples and our FAQ can be found at: https://cddis.nasa.gov/Data_and_Derived_Products/CDDIS_Archive_Access.html.
If you still have difficulty after reading and attempting the examples on that page, please contact us at support-cddis@earthdata.nasa.gov.
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IGS analysis centers currently provide station position and velocity solutions to the CDDIS on a daily basis; prior to mid-2012, these solutions were issued weekly. The analysis centers provide station position, velocities, daily length-of-day (LOD) and X, Y pole positions and rates, and geocenter position solutions. The IGS reference frame coordinator retrieves these solutions and produces a combined product, which is then in turn archived at the CDDIS in SINEX format. These combination solutions are considered the official IGS products, which contribute to the International Terrestrial Reference Frame (ITRF).
Solution summary files are provided by the analysis centers in which they describe their analysis methods and strategies and list processing statistics. Descriptions of AC analysis procedures and models used are available from the IGS website.
All operational IGS GNSS products, including the station position solutions, are available in subdirectories by GPS week. The station positions and velocity files are stored in Solution Independent Exchange (SINEX) format.
In 2009 and 2013, the IGS initiated “reprocessing campaigns” (repro1 and repro2 respectively). The IGS analysis centers re-processed the GNSS data from the global network of IGS stations (from 1994 to 2007 for repro1, from 1994 through 2012/2013 for repro2) to produce a fully consistent set of products utilizing the most recent models and updated processing strategies. These reprocessed solutions are available within the weekly subdirectory structure as outlined below, in /repro1 and /repro2 subdirectories.
The starting directories for these files (GPS and GPS+GLONASS solutions) are:
and for GLONASS-only solutions:
Anonymous ftp service will be discontinued on October 31, 2020.
Append the following directory and file names to the starting directory:
WWWW/AAAWWWWD.TYP.Z
Gnss Software Download
as described in the table below.
| cod Code (weekly or daily based on 3-day arcs) | cof Code (daily based on 1-day arcs) |
|---|---|
| emr | NRCan |
| emx | NRCan (GLONASS only) |
| esa | ESA |
| eur | EUREF |
| gfz | GFZ |
| grg | GRGS |
| gsi | GSI |
| igr | IGS rapid solution combination |
| igs | IGS final solution combination |
| igu | IGS ultra-rapid solution combination |
| jpl | JPL |
| mcc | MCC (GLONASS only from SLR data) |
| mit | MIT |
| mig | MIT |
| ncl | University of Newcastle |
| ngs | NOAA/NGS |
| sio | SIO |
| sir | SIRGAS |
| Code | Meaning |
|---|---|
| snx | Station position and velocity solution |
| ssc | Shortened position and velocity solution files (without matrices) |
| sum | Analysis summary |
| erp | Earth rotation parameters |
| Code | Meaning |
|---|---|
| WWWW | GPS week |
| AAA | analysis center name/type of solution |
| D | day of week (0-6, 7 indicates weekly) |
| TYP | type of solution |
| .Z | UNIX compressed file |
The IGS combined, final station position solutions (GNSS only) are available on a weekly basis.
The starting directory for these files is:
https://cddis.nasa.gov/archive/gnss/products/ (GPS and GPS+GLONASS solutions)
Append the following directory and file names to the starting directory as described in the table below the list.
Gnss Solutions Tutorials
| WWWW/igsyyPwwwwd.snx.Z | Combined daily station position/velocity solutions (stations without DOMES numbers removed) doi: 10.5067/GNSS/gnss_igssnx_001 |
| WWWW/igsyyPwwwwd.ssc.Z | Combined daily station coordinate solutions (stations without DOMES numbers removed) doi: 10.5067/GNSS/gnss_igsssc_001 |
| WWWW/igsyyPwwwwd.res.Z | Residuals between AC solutions and combined solutions doi: 10.5067/GNSS/gnss_igsres_001 |
| WWWW/igsyyPwwwwd_all.snx.Z | Combined daily station position/velocity solutions (for all stations) doi: 10.5067/GNSS/gnss_igssnx_001 |
| WWWW/igsyyPwwwwd_all.ssc.Z | Combined daily station coordinate solutions (for all stations) doi: 10.5067/GNSS/gnss_igsssc_001 |
| WWWW/igsyyPwwwwd_ITR.res.Z | Residuals between AC solutions and IGS Reference Frame doi: 10.5067/GNSS/gnss_igsitrres_001 |
| WWWW/igsyyPwwwwd_IGS.res.Z | Residuals between AC solutions and cumulative solution doi: 10.5067/GNSS/gnss_igscres_001 |
| WWWW/igsyyPwwww.snx.Z | Combined weekly station position/velocity solutions (stations without DOMES numbers removed) doi: 10.5067/GNSS/gnss_igssnx_001 |
| WWWW/igsyyPwwww.ssc.Z | Combined weekly station coordinate solutions (stations without DOMES numbers removed) doi: 10.5067/GNSS/gnss_igsssc_001 |
| WWWW/igsyyPwwww.erp.Z | Daily Earth rotation parameters doi: 10.5067/GNSS/gnss_igserpp_001 |
| WWWW/igsyyPwwww.sum.Z | Solution summary file doi: 10.5067/GNSS/gnss_igssump_001 |
| WWWW/IGSyyPww.snx.Z | Cumulative combined solution doi: 10.5067/GNSS/gnss_igscsnx_001 |
| WWWW/IGSyyPww.ssc.Z | Cumulative combined set of station coordinates solution doi: 10.5067/GNSS/gnss_igscssc_001 |
| igs00p03.erp.Z | Daily Earth rotation parameters since GPS week 0860 doi: 10.5067/GNSS/gnss_igserpc_001 |
| Code | Meaning |
|---|---|
| WWWW | GPS week |
| yy | 2-digit year |
| wwww | GPS week |
| d | day of week (0-6) |
| ww | week of year |
| .Z | Unix compressed file |
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