NASA’s Crustal Dynamics Data Information System (CDDIS) began archiving data from flight receivers aboard low Earth orbit (LEO) satellites in support of the IGS LEO Working Group. Satellite data available in this archive include CHAMP, ICESat-1, Jason-1, and SAC-C. All flight receiver data are stored in RINEX format.
The starting directory for these files is:
Append the following directory and file names to the starting directory:
SATNAME/YYYY/DDD/SSSSDDD0.YYt.Z
as described in the table below.
| Code | Meaning |
|---|---|
| SATNAME | satellite name |
| YYYY | 4-digit year |
| DDD | 3-digit day of year |
| SSSS | satellite code |
| YY | 2-digit year |
| t | type of data: d = Hatanaka-compressed observation data s = observation summary files (output of TEQC) o = ICESat GPS data in standard RINEX format pc = ICESat position solution from receiver |
| .Z | UNIX compressed file |