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CDDIS Computer System Outage
15 Novemebr 2017

CDDIS must undergo an unplanned outage on 16-Nov-2017 from 14:00-18:00 EST (19:00–22:00 UTC) to replace critical system hardware. All CDDIS services (archive/website access, file upload) will not be accessible; however, the real-time CDDIS GNSS caster will remain operational. We expect that the system outage will not require the full 4 hours but have allocated time to address any unforeseen issues.

We apologize for any inconvenience these outages may cause the user community.

GRACE mission ends science operations
27 October 2017

After more than 15 productive years in orbit, the U.S./German GRACE (Gravity Recovery and Climate Experiment) satellite mission has ended science operations. During their mission, the twin GRACE satellites have provided unprecedented insights into how our planet is changing by tracking the continuous movement of liquid water, ice and the solid Earth.


Interruptions in network connectivity to CDDIS
27 October 2017

The CDDIS network will undergo maintenance on Tuesday, October 31, 2017 between 15:00 - 19:00 UTC. There may be extended interruptions in connectivity to the CDDIS during this maintenance period but we expect only short 5-10 minute outages during the timeframe.

We apologize for any inconvenience these outages may cause the user community.

NASA Earth Science Data and Services Survey for 2017
15 September 2017

Dear Colleagues,

Recently, some of you may have received an email from the CFI Group on behalf of NASA. This message asked you to complete a survey for users of NASA Earth science data and services, which includes the Crustal Dynamics Data Information System (CDDIS). The CDDIS is one of twelve NASA Earth Observing System Data and Information System (EOSDIS) science data centers evaluated by this survey. The purpose of this survey is to help NASA and the DAACs assess customer satisfaction and improve future services. Suggestions from past surveys have been implemented to improve the tools and services offered by the CDDIS.

Please participate! Your feedback affects our future performance and helps to identify science needs. You will be able to take the survey for each DAAC you use. This is your opportunity to influence the priorities of the DAACs, including CDDIS. Thank you in advance to all of you who are willing to spend a few minutes to complete the survey.

If you did not receive a survey and wish to complete one or know of someone who uses CDDIS and/or EOSDIS data and services who did not receive a survey, please contact

The American Customer Satisfaction Index (ACSI) is the only national cross-industry measure of customer satisfaction in the United States. NASA commissioned the CFI Group, an independent research and consulting organization, to conduct a brief survey to rate the products and services NASA currently provides from NASA's EOSDIS data centers. Please consider responding to this survey; your input will help us to better serve our user community.

Presentations of these results given to NASA Earth science are available at: satisfaction-index-reports

Thank you in advance to all of you who are willing to spend a few minutes to complete the survey.

Weekly GNSS data holdings (daily, hourly, high-rate)

Weekly SLR normal point pass segment totals (by satellite, LAGEOS and ETALON only)

Archive Explorer Tool Search the CDDIS data archive for SLR, DORIS, or GNSS data.

Site Log Viewer Tool Browse SLR, DORIS, or GNSS site logs by site or across the network.

Site Selection Tool Search and discover CDDIS data holdings using the GSAC-WS.