On 31 October 2020, anonymous ftp access will officially be discontinued at CDDIS. Beginning October 1, 2020, CDDIS will bandwidth limit ALL IPs using anonymous ftp to just 50KB/s and will limit simultaneous downloads to only 3 per IP address. 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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On-board receiver data

The CDDIS began archiving data from flight receivers on board 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:

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

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


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Satellite Name

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Satellite NameCode

as described in the table below.

Code Meaning
SATNAME satellite name
YYYY4-digit year
DDD3-digit day of year
SSSSsatellite code
YY2-digit year
ttype 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