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Text Content

EARTHDATA
Welcome to NASA's EOSDIS

NASA's Earth Observing System Data and Information System (EOSDIS) is a key core
capability in NASA’s Earth Science Data Systems Program for archiving and
distributing Earth science data from multiple missions to users.

This bar indicates that you are within the EOSDIS enterprise which includes 12
science discipline-oriented Distributed Active Archive Centers (DAACs)
supporting diverse user communities in science research, applied science
research, applications, as well as the general interested public.

Find a DAAC / Other DAACs - Use these links to navigate to any of the 12 EOSDIS
DAACs.

Feedback - Provide feedback about the site that is currently being viewed.

Feedback
Other DAACs▾
 * ASDC
 * ASF DAAC
 * CDDIS
 * GES DISC
 * GHRC DAAC
 * LAADS DAAC
 * LP DAAC
 * NSIDC DAAC
 * OB.DAAC
 * ORNL DAAC
 * PO.DAAC
 * SEDAC

 * Home
 * About CDDIS
   * About CDDIS
   * Background
   * Citing Our Data
   * News
   * Meetings
   * Space Geodesy Contacts
   * Links
   * FAQ
   * Acronyms
   * Staff
   * Contact Us
 * Data and Products
   * Data and Products
   * GNSS
   * SLR
   * VLBI
   * DORIS
   * Archive search information
   * Archive access information
   * Reports
 * Techniques
   * Techniques
   * GNSS
   * SLR
   * VLBI
   * DORIS
 * Programs
   * Programs
   * Current
   * Historical
 * Publications
   * Publications
   * Presentations
   * Papers
 * Citing our Data
 * 

 * Access Data and Products
 * GNSS - Global Navigation Satellite System
 * SLR - Satellite Laser Ranging
 * VLBI - Very Long Baseline Interferometry
 * DORIS - Doppler Orbitography and Radio-positioning Integrated by Satellite

Global and Regional Network Maps

Reset

 * GNSS
 * SLR
 * VLBI
 * DORIS


World
Africa
Antarctica
Asia
Australia
California
Europe
North America
Pacific
South America

Learn about Techniques
GNSS
 * Overview
   
 * International GNSS Service (IGS)
 * Related links

Global Geo-Spatial Positioning
SLR
 * Overview
   
 * International Laser Ranging Serrvice (ILRS)
 * Related Links

Millimeter Ranging System
VLBI
 * Overview
   
 * International VLBI Service for Geodesy and Astrometry (IVS)
 * Related Links

Geometric Technique
DORIS
 * Overview
   
 * International DORIS Service (IDS)
 * Related Links

Dual Frequency Doppler System
News
The SLR-tailored version of ITRF2020, the SLRF2020, has been released to the
public
25 July 2023

The long-awaited SLR-tailored version of ITRF2020, the SLRF2020, has been
released to the public, along with the associated Data Handling File required
for proper and accurate reduction of SLR data. Both files contain notes that are
important to users, especially to those requiring the highest quality results in
their work; it is imperative that users read these notes before implementing the
new TRF in their production lines.

The two files can be accessed from the ILRS website pages:

https://ilrs.gsfc.nasa.gov/science/dataAnalysisResources/index.html
https://ilrs.gsfc.nasa.gov/network/site_information/index.html

CDDIS Landing pages with the appropriate DOIs are here:

https://cddis.nasa.gov/Data_and_Derived_Products/SLR/slrf_2020.html
https://cddis.nasa.gov/Data_and_Derived_Products/SLR/slrf_2020_DHF.html

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NASA Earth Science Data and Services Survey for 2022
29 September 2022

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

surveyhelp@cfigroup.com.

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:

https://earthdata.nasa.gov/acsi

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

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The CDDIS to present webinar titled, "GNSS Products at NASA's CDDIS for Disaster
Monitoring, Crustal Deformation, Extreme Weather, and Other Applications" on
September 28, 2022
20 September 2022

On Wednesday, September 28, 2022, at 2:00 PM EDT (18:00 UTC), the CDDIS will
present a webinar titled, "GNSS Products at NASA's CDDIS for Disaster
Monitoring, Crustal Deformation, Extreme Weather, and Other Applications". The
presenters will be Dr. Patrick Michael, CDDIS; Dr. Yehuda Bock, Scripps Orbit
and Permanent Array Center, U. of California San Diego; and Dr. Angelyn Moore,
Ionospheric and Atmospheric Remote Sensing Group, Jet Propulsion Laboratory,
California Institute of Technology. Join us to learn about the NASA Making Earth
System Data Records (ESDR) for Use in Research Environments (MEaSUREs) Extended
Solid Earth Science ESDR System (ESESES) project, whose Global Navigation
Satellite System (GNSS)-derived data products enable research on tectonic
motion, crustal deformation, earthquakes, tsunamis, sea level rise, extreme
weather, and more!

Register now at
https://www.earthdata.nasa.gov/learn/webinars-and-tutorials/webinar-cddis-gnss-2022-09-28



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The CDDIS will reformat all existing MD5SUMS and SHA512SUMS checksum files
18 August 2022

Beginning Monday, August 29, 2022: In order to correct a format error by CDDIS
and make it match the current expected format of MD5 and SHA512 checksum
utilities, the CDDIS will reformat all existing MD5SUMS and SHA512SUMS checksum
files, switching from <filename><space><checksum> to
<checksum><space><space><filename>. Thank you for your patience while we
complete this work. For questions and concerns, please contact us at
support-cddis@earthdata.nasa.gov

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Read more news...
Reports
Weekly GNSS data holdings (daily, hourly, high-rate)

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

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DORIS data holdings (by year and by satellite, satellite and filename)
Data Discovery

Search the CDDIS archive by using the NASA Earthdata Search API. This
comprehensive API allows you to create queries that can be integrated into
custom software enabling a wide range of searches to be built. Examples are
provided for Python and cURL.

FAQ
Contact Us
User Forum
NASA Privacy Policy and Important Notices
USA.gov

Responsible NASA Official: Patrick Michael
Web Curator: Lori J. Tyahla
Last modified date: Jul 25, 2023