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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High-rate data

The CDDIS archive contains GNSS data from the global network of permanent GNSS receivers operating at a higher, 1-second sampling rate. These data are submitted and archived in files containing 15 minutes of data. IGS analysis centers retrieve these sub-hourly data files to produce IGS near real-time and "ultra-rapid" products such as satellite ephemerides, clocks, and Earth rotation parameters.

IGS stations forward the sub-hourly 1-second GNSS data in compressed RINEX format to the CDDIS within minutes following the end of the 15-minute time block. At the present time, sub-daily data from an average of 160-170 high-rate sites are archived each day. Many of the sites are real-time, streaming sites whose data are captured and translated into blocks of 15-minutes of RINEX data. High-rate GNSS data available in RINEX V2 format use the mmmmDDDHMM.YYt.Z filename convention and are in UNIX compressed format. Starting with data from 2016, all high-rate 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/highrate area.

The starting directory for these sub-hourly, high-rate files is:


Append the following directory and file names to the starting directory using the format codes in the links below::


RINEX V2 format
View format codes


RINEX V3 format
View format codes