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The purpose of this page of the CDDIS web site is to post new items, activities, data sets, etc. of interest to the CDDIS user community. Users should also consult the meetings page to view a list of upcoming meetings and events of interest to the space geodesy community.

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NASA Earth Science Data and Services Survey for 2021
(23 September 2021)

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.

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:


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

ILRS logo

Second circular for ILRS Virtual World Tour 2021 released
(31 August 2021)

Dear Colleagues:

We are happy to report the updates on this year's "ILRS Virtual World Tour". In addition to the virtual visits to the stations (∼120 min), short special add-on sessions (30-60 min) are planned with the help of the Standing Committee Chairs. We look forward to seeing you in the last week of October.

Schedule (tentative; in UTC):

Monday, October 25
12:00 Opening session with reports from ILRS CB and Geodetic Community
12:45 Virtual Tour of Herstmonceux, UK

Tuesday, October 26
13:00 Virtual Tour of Wettzell, Germany
15:00 Special Session on Network & Engineering, LLR and Space Debris Ranging

Wednesday, October 27
13:00 Virtual Tour of Mendeleevo, Russia
15:00 Special Session on Analysis

Thursday, October 28
06:00 Virtual Tour of Shanghai, China
08:00 Special Session on Missions (1)

Friday, October 29
16:00 Virtual Tour of Monument Peak, USA
18:00 Special Session on Data Format and Missions (2), and Closing

Workshop website: https://ilrs.gsfc.nasa.gov/ILRS_Virtual_World_Tour_2021/index.html

Microsoft Teams will be used for all of these sessions.
The Third Circular will be issued later with details on registration.

ILRS Virtual World Tour 2021 Organizers:
Claudia Carabajal/SSAI, Inc @ NASA Goddard Space Flight Center, USA
Evan Hoffman/NASA Goddard Space Flight Center, USA
Igor Ignatenko/VNIIFTRI, Russia
Jason Laing/Peraton NSGN Operations Lead, USA
Toshimichi Otsubo/Hitotsubashi University, Japan (Chair)
Michael Pearlman/Center for Astrophysics, USA
Ulrich Schreiber/Geodetic Observatory Wettzell, Germany
Zhang Zhongping/Shanghai Astronomical Observatory, China

Thomas Herring in the field with snow-covered mountains behind.

Dr. Thomas A. Herring, CDDIS data user profile
(07 January 2021)

One of the great achievements of the space age is the Global Navigation Satellite System (GNSS), which enables the precise location in time and space of any point on Earth. In a new NASA Earth Observing System Data and Information System (EOSDIS) Data User Profile, read how Dr. Thomas A. Herring uses GNSS data from NASA's Crustal Dynamics Data Information System (CDDIS) and other sources to measure surface deformation with ever-increasing precision.

Read about Dr. Herring's research on the Earthdata website...