On 31 October 2020, anonymous ftp access will officially be discontinued at CDDIS. Beginning August 10, 2020, CDDIS will bandwidth limit ALL IPs using anonymous ftp to just 250KB/s transfer rates. 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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Cite the CDDIS

If you are using CDDIS data for a research publication, we ask that you properly acknowledge and or cite the CDDIS. Distribution of the CDDIS data sets is funded by NASA's Earth Science Data Systems program. The data are not copyrighted; however, in the event that you publish data or results using these data, we request that you include the following acknowledgment and/or citation:

The data used in this study were acquired as part of NASA's Earth Science Data Systems and archived and distributed by the Crustal Dynamics Data Information System (CDDIS).

Noll, Carey E., The Crustal Dynamics Data Information System: A resource to support scientific analysis using space geodesy, Advances in Space Research, Volume 45, Issue 12, 15 June 2010, Pages 1421-1440, ISSN 0273-1177, http://dx.doi.org/10.1016/j.asr.2010.01.018.

We would appreciate an email containing the publication reference to carey.noll @ nasa.gov.