US Government security requirements no longer permit CDDIS to offer data via traditional unencrypted anonymous ftp; this service was discontinued on October 31, 2020. All data are still available, however access must be via HTTPS or ftp-ssl.

Instructions with examples and our FAQ can be found at: https://cddis.nasa.gov/Data_and_Derived_Products/CDDIS_Archive_Access.html.

If you still have difficulty after reading and attempting the examples on that page, please contact us at support-cddis@earthdata.nasa.gov.

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Other DORIS Products

Earth orientation parameters (EOP)
doi: 10.5067/DORIS/DORIS_IDSEOP_001

Doppler Orbitography by Radiopositioning Integrated on Satellite (DORIS) Earth Orientation Parameters Time Series Product from the NASA Crustal Dynamics Data Information System (CDDIS). DORIS observations from a global network can be utilized for a variety of products. Analysis Centers (ACs) of the International DORIS Service (IDS) retrieve DORIS data on a regular basis to compute various DORIS products from data generated by the DORIS beacons supporting the IDS network, including the time series of Earth orientation parameters (EOPs). The IDS Analysis Center Coordinator combines these solutions to produce an official IDS EOP product. The EOP time series are available in text format.

IDS Earth orientation parameters (EOP) products are online:

as follows:

cccWWwdVV.eop.Z

Code Meaning
ccc 3-character analysis center name
WW year of submission
VV version number
.Z UNIX compressed file

Coordinates of the TRF origin
doi: 10.5067/DORIS/DORIS_IDSGEOC_001

Doppler Orbitography by Radiopositioning Integrated on Satellite (DORIS) Geocenter Time Series Product from the NASA Crustal Dynamics Data Information System (CDDIS). DORIS observations from a global network can be utilized for a variety of products. Analysis Centers (ACs) of the International DORIS Service (IDS) retrieve DORIS data on a regular basis to compute various DORIS products from data generated by the DORIS beacons supporting the IDS network, including the time series of coordinates of the geocenter or the origin of the terrestrial reference frame. The IDS Analysis Center Coordinator combines these solutions to produce an official IDS geocenter product. The geocenter time series are available in text format.

IDS Coordinates of the TRF origin (geocenter) products are online:

as follows:

cccWWwdVV.geoc.Z

Code Meaning
ccc 3-character analysis center name
WW year of submission
VV version number
.Z UNIX compressed file

Ionosphere product
doi: 10.5067/DORIS/DORIS_IDSIONO_00

Doppler Orbitography by Radiopositioning Integrated on Satellite (DORIS) Ionospheric Product from the NASA Crustal Dynamics Data Information System (CDDIS). DORIS observations from a global network can be utilized for a variety of products. Analysis Centers (ACs) of the International DORIS Service (IDS) retrieve DORIS data on a regular basis to compute various DORIS products from data generated by the DORIS beacons supporting the IDS network. These products include ionospheric products providing time derivatives of the Total Electron Content (TEC) obtained from the DORIS doppler data. These DORIS derived ionospheric products are available in text format.

IDS Ionosphere products are online:

in subdirectories by satellite as follows:

sssVV.YYDDD.iono.Z

Code Meaning
sss 3-character satellite name
VV version number
YY last two digits of year
DDD three-digit day of year
.Z UNIX compressed file