National Aeronautics and Space Administration

Draft RFP for the SGSLR Network Build released
12/21/2016
The Draft RFP for the SGSLR Network Build has been released and can be found at https://www.fbo.gov/notices/6f8c20c871522bb73badfcc073374ab2.

Special collection of DORIS-related titled, "The Scientific Applications of DORIS in Space Geodesy", published in the journal "Advances in Space Research"
12/06/2016
The International DORIS Service (IDS) has just published in the journal "Advances in Space Research" a special collection of papers entitled "The Scientific Applications of DORIS in Space Geodesy". DORIS is one of the four fundamental techniques that contributes to the terrestrial reference frame. It is also a prime tracking technique for LEO satellites, including those that map the oceans with radar altimetry.

The eighteen papers in the special issue cover five themes:

• ITRF2014 -- the papers discuss the DORIS contribution to the new realization of the International Terrestrial Reference Frame (ITRF);
• DORIS Ultra-Stable Oscillator (USO), Jason-2;
• Precise Orbit Determination;
• DORIS System and Network;
• Intertechnique comparisons of DORIS products.

The papers are published in Volume 58, Number 12 of the Journal Adv. Space Res. Of the 18 papers, four were led or featured significant contributions from NASA GSFC & JPL authors. The Guest Editors of the special issue were Frank G. Lemoine (Code 61A, Geodesy & Geophysics Laboratory, NASA GSFC) and Ernst J.O. Schrama (Faculty of Aerospace Engineering, Delft University of Technology, Delft, The Netherlands).

This special issue marks the third time the DORIS community has published a special issue in a peer-reviewed journal dedicated to scientific and technical aspects of the DORIS technique. The previous special issues dedicated to DORIS were published in the journal Adv. Space Res. (two volumes in 2010) and in the Journal of Geodesy (2006).

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The CDDIS successfully moves all primary operations to an upgraded computer system
12/01/2016
The CDDIS successfully moved all primary operations to an upgraded computer system on December 01, 2016; in total, the CDDIS archive was inaccessible to the user community for approximately 30 hours during the transition. The new IT infrastructure provides a more robust, reliable, and expandable system with increased storage capacity to handle future growth. All suppliers of data, derived products, and ancillary files for the CDDIS archive were required to modify their software to use the HTTP protocol for file upload. In addition to new hardware, the CDDIS archive processing software was redesigned and improved to provide for more efficient operations and additional QC on incoming files.

CDDIS unavailable November 30-December 01 for transition to new systems
11/17/2016
On November 30, 2016 at 13:00 UTC, CDDIS will terminate all services (ftp, CDDIS/ILRS/SGP websites, data deliveries) as we transition to all new hardware and facilities. We are projecting about 24 hours to fully move to our new facilities and ensure all operations are back to normal. As such, all users need to plan on a 24+ hour disruption of service to the CDDIS archive with resumption of normal operations no earlier than December 01, 2016 at 17:00 UTC.

In summary the following will take place:

• 30 November 2016 at 13:00 UTC – All current production services (ftp, http, etc) will be shutdown.
• 01 December 2016 at 17:00 UTC – all web and anonymous ftp access is restored for access to the archive. NOTE: restoration could occur sooner but no guarantees are made.
• Currently used addresses, e.g., cddis.nasa.gov or cddis.gsfc.nasa.gov, will continue to work as before the transition. However, if you are using a numeric IP address to access any CDDIS resources your scripts will fail as all current IP addresses will change during the transition.
• 02 December 2016 – All CDDIS operations should be returned to normal service.

While CDDIS is unavailable, users can access one of the other data centers supporting the services:

• IGS: http://www.igs.org/about/data-centers
  
• ILRS: http://ilrs.gsfc.nasa.gov/data_and_products/data_centers/index.html (check before November 30!)
  
• IVS: http://ivscc.gsfc.nasa.gov/about/org/components/dc-list.html
  
• IDS: http://ids-doris.org/data-products/info.html
  
  

All questions on the CDDIS transition should be directed to cddis-help@lists.nasa.gov.

Space Geodesy Project Issues Solicitation for New VLBI Antennas
11/08/2016
The Space Geodesy Project posted a request for proposal for the construction, deployment and commissioning of up to three Very Long Baseline Interferometer (VLBI) antennas that will be part of the new NASA Space Geodesy Network (NSGN) and the VLBI2010 Global Observing System (VGOS). Details on the solicitation can be found here:
https://www.fbo.gov/spg/NASA/GSFC/OPDC20220/NNG16573944R/listing.html.

User Profile: Dr. Erricos C. Pavlis
08/11/2016
NASA Earthdata has published a user profile of Dr. Erricos Pavlis as part of their "Who uses NASA Earth science data?" series.