NASA will be performing network maintenance on Thursday, May 13 from 3:00pm - 8:00pm (1900 UTC - 0000 UTC). You may experience network difficulties accessing ALL CDDIS services. You may experience outages as long as 15 minutes and multiple short (several minute) intermittent outages as well during the maintenance window.

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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