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 calendar to
view a list of upcoming meetings and events of interest to the space
DAAC Annual Article Featuring CDDIS Data Published (11-Oct-2013)
A feature article, "Sizing a Tsunami.", has recently been published about research in rapid measurement and forcast of tsunami size and direction using data from global networks of GNSS receivers. The article is part of the 2013 issue of Sensing Our Planet: NASA Earth Science Research Feature, an annual publication of the Earth Observing System Data and Information System (EOSDIS).
NASA Earth Science Data and Services Survey for 2013 (14-Aug-2013)
In the next few days, you will receive an email from CFI Group on behalf of NASA. This message will ask you to complete a survey of users of NASA Earth science data and services, which includes the Crustal Dynamics Data Information System (CDDIS). The purpose of this survey is to help NASA and the data centers assess customer satisfaction and improve future services.
The American Customer Satisfaction Index (ACSI) is the #1 national economic indicator of customer satisfaction for more than 225 companies and over 130 customer programs and services at federal agencies. The survey is being conducted by CFI Group under contract with the Department of Interior's Federal Consulting Group, Executive Agent in government for the ACSI. Please consider responding to this survey; your input will help us to better serve our user community.
Results from the 2012 survey are available online at http://www.theacsi.org/ (under ACSI RESULTS > Government Results Benchmarks, http://www.theacsi.org/acsi-results/government-benchmarks). In addition, presentations of these results given to NASA
Earth science are available at: http://earthdata.nasa.gov/about-eosdis/performance/american-customer-satisfaction-index-reports.
Thank you in advance to all of you who are willing to spend a few minutes to complete the survey.
CNAV Test Data Set Available (05-Aug-2013)
The GPS Directorate conducted the first test transmission of CNAV (civilian navigation) messages on L2C- and L5-capable satellites in June 2013. The civilian navigation message types will provide improved navigation through the use of the new L2C and L5 civilian frequencies. The German Aerospace Center (DLR) and the University of New Brunswick (UNB) teamed up to collect the CNAV data with five multi-GNSS receivers in the U.S., Canada, South Africa, Singapore, and Australia. Through the International GNSS Service (IGS) Multi-GNSS experiment (MGEX) archive at the CDDIS, these data are now available to interested users at: ftp://cddis.gsfc.nasa.gov/gnss/data/campaign/cnav/2013/06/.
Tne data set, described in the ftp://cddis.gsfc.nasa.gov/gnss/data/campaign/cnav/2013/06//aaaReadme.txt file, consists of daily collections of raw binary CNAV navigation frames, interpreted data listings, and RINEX-style navigation messages.
The team at DLR and UNB request that users of the data set share their analysis with the scientific community and to give proper credits to the International GNSS Service (IGS) and the MGEX project.
Test Data Set from NGA Archived (10-Jul-2013)
The National Geospatial-Intelligence Agency (NGA) has provided data from their permanent network of monitoring sites for evaluation by the IGS Analysis Centers. These data span 2010-2012 and include data from: Adelaide, Buenos Aires, Osan, Pretoria, Wellington, Quito, Bahrain, Washington D.C., Hermitage, and Eielson. The data are available in subdirectories by year from: ftp://cddis.gsfc.nasa.gov/gnss/data/ngatest.
The files contain RINEX observation data at a 30 second sampling rate. According to NGA, until recently, the receivers would output phase data with non-integer ambiguities; i.e., ambiguities with a resolution of half cycles. These data have been processed to remove non-integer phase ambiguities by correcting the to data to resolve to integer values. However, some cases of satellite passes containing half cycle ambiguities may have gone undetected and remain.
NGA stations are equipped with two identical receivers for redundancy. The receivers share an antenna, but are each connected to separate high performance cesium frequency standards for an external reference frequency signal. The receivers have two designations. First the units are identified as either receiver 1 or 2. The archive contains data from both receivers.
2014 ILRS Technical Workshop Announcement (01-Jul-2013)
NASA Goddard Space Flight Center (GSFC) plans to host the 2014 ILRS Technical Workshop during the week of October 27-31, 2014. This week will mark the 50th anniversary of the first SLR measurement, conducted at what is now the Goddard Geophysical and Astronomical Observatory. The theme for this workshop "Celebrating 50 Years of SLR: Remembering the Past and Planning for the Future" will provide an excellent opportunity to review where we have come over these last 50 years and look forward to many more years of technology developments and scientific research. Please add this to event to your calendars. Thank you.
CDDIS Accepted as Regular member of the International Council for Science (ICSU) World Data System (WDS) (27-Mar-2013)
The CDDIS has recently been accepted as a regular member of the International Council for Science (ICSU) World Data System (WDS). The WDS strives to enable open and long-term access to multidisciplinary scientific data, data services, products and information. The WDS works to ensure long-term stewardship of data and data services to a global scientific user community.
What Was New in: