NASA’s Crustal Dynamics Data Information System (CDDIS) archive contains Global Navigation Satellite Systems (GNSS) data from the global network of permanent GNSS receivers supporting the IGS operating at a 30-second sampling rate and containing one hour of data. IGS analysis centers retrieve these hourly data files to produce IGS "rapid" and "ultra-rapid" products such as satellite ephemerides, clocks, and Earth rotation parameters, which are then submitted to CDDIS. The IGS Analysis Center Coordinator generates a daily, combined, rapid product with a 17-hour latency. The ultra-rapid (predicted) orbit and clock products are generated four times per day.
File Formats
IGS stations forward hourly 30-second GNSS data in compressed RINEX format to CDDIS within minutes following the end of the hour. At the present time, an average of 360 sites are archived in this fashion each day for availability to the global science community. Hourly GNSS data available in RINEX V2 format use the mmmmDDDH.YYt.gz filename convention and are in gzipped format, as of December 1, 2020. Files received prior to this date use the mmmmDDDH.YYt.Z filename convention and are in a Unix compressed format. Starting with data from 2016, all hourly GNSS data in RINEX V3 that use the RINEX V3 filenaming convention and the gzip compression format are archived with data in RINEX V2 format, in subdirectories in the /gnss/data/hourly area.
At the close of the UTC day, the station operators incorporate individual hourly GNSS data into a full day's data file, submitted to the CDDIS and made available in the daily GNSS data directories. These hourly files are stored in hourly subdirectories within the file system.
Starting Directory
The starting directory for these files is:
https://cddis.nasa.gov/archive/gnss/data/hourly/
Append the following directory and file names to the starting directory using the format codes in the links below.
RINEX V2 Format
| RINEX V2 file naming convention | YYYY/DDD/HH/mmmmDDDH.YYt.gz |
|---|
RINEX V2 File Name Codes
| Code | Meaning | |
|---|---|---|
| YYYY | 4-digit year | |
| DDD | 3-digit day of year | |
| HH | 2-digit hour of day (00, 01, ..., 23) | |
| mmmm | 4-character site monument name | |
| H | 1-character hour of day (a = 00, b = 01, ..., x = 23) | |
| YY | 2-digit year | |
| t | type of data: | |
| d | Hatanaka-compressed observation data (doi:10.5067/GNSS/gnss_hourly_d_001) | |
| g | GLONASS broadcast ephemeris data (doi:10.5067/GNSS/gnss_hourly_g_001) | |
| m | compressed meteorological data (doi:10.5067/GNSS/gnss_hourly_m_001) | |
| n | GPS broadcast ephemeris data (doi:10.5067/GNSS/gnss_hourly_n_001) | |
| .gz | Compressed file | |
RINEX V3 Format
| RINEX V3 file naming convention | YYYY/DDD/HH/XXXXMRCCC_K_YYYYDDDHHMM_01H_30S_tt.FFF.gz |
|---|
Note: The "30S" sampling rate string is optional for navigation and meteorological files, and may not be included in every file name of these types.
RINEX V3 File Name Codes
| Code | Meaning | |
|---|---|---|
| YYYY | 4-digit year | |
| DDD | 3-digit day of year | |
| HH | 2-digit hour of day (00, 01, ..., 23) | |
| XXXX | 4-character IGS station name | |
| M | monument or marker number (0-9) | |
| R | receiver number (0-9) | |
| CCC | ISO country code | |
| K | Data source: | |
| R | From Receiver data using vendor or other software | |
| S | From data Stream (RTCM or other) | |
| U | Unknown | |
| DDD | 3-digit day of year | |
| HH | 2-digit hour (00, 01, ..., 23) | |
| MM | 2-digit minute | |
| tt | type of data: | |
| GO | GPS Observation data | |
| RO | GLONASS Observation data | |
| EO | Galileo Observation data | |
| JO | QZSS Observation data | |
| CO | BDS Observation data | |
| IO | IRNSS Observation data | |
| SO | SBAS Observation data | |
| MO | Mixed Observation data (doi:10.5067/GNSS/gnss_hourly_o_001) | |
| GN | GPS Navigation data (doi:10.5067/GNSS/gnss_hourly_n_001) | |
| RN | GLONASS Navigation data (doi:10.5067/GNSS/gnss_hourly_g_001) | |
| EN | Galileo Navigation data (doi:10.5067/GNSS/gnss_hourly_l_001) | |
| JN | QZSS Navigation data (doi:10.5067/GNSS/gnss_hourly_q_001) | |
| CN | BDS Navigation data (doi:10.5067/GNSS/gnss_hourly_f_001) | |
| IN | IRNSS Navigation data (doi:10.5067/GNSS/gnss_hourly_i_001) | |
| SN | SBAS Navigation data (doi:10.5067/GNSS/gnss_hourly_h_001) | |
| MN | Navigation data (All GNSS Constellations) (doi:10.5067/GNSS/gnss_hourly_x_001) | |
| MM | Meteorological Observation (doi:10.5067/GNSS/gnss_hourly_m_001) | |
| FFF | File format: | |
| rnx | RINEX | |
| crx | Hatanaka Compressed RINEX | |
| .gz | Compressed file | |