Article
IGS Privacy Updates and Information
May 24, 2018 • 176 Views

The IGS cares about privacy, and has made some improvements and changes regarding collection and management of personal information, partially in response to the European Union General Data Protection Regulation (GDPR). These changes will go into effect on 25 May 2018.

First, please click here to confirm that you would still like to receive emails from IGS mailing lists.

Second, please view our Privacy Policy to learn about how we handle data.

Finally, on the IGS Privacy page, you can learn more about how we use personal data, and how to remove your information from mailing lists, membership rosters, the Site Log Manager, and other instances where your personal information may appear on the IGS website.

If you have any questions or concerns about this, please don’t hesitate to contact the IGS Central Bureau at CB @ IGS.org. For assistance with updating your personal data preferences, or to file a complaint, please contact support @ IGS.org.


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IGS Workshop 2018 - Website Available
May 9, 2018 • 836 Views

The IGS is pleased to announce upcoming IGS Workshop in Wuhan. This five-day workshop will bring scientists, engineers, and geodesists from all over the world to the campus of Wuhan University for a week of presentations, discussions, and meetings. The workshop will be composed of two keynote talks, plenary sessions with invited oral presentations, poster sessions, numerous working group splinter meetings, and other noteworthy events.

If you need a letter of invitation for a visa, please submit your Travel and Visa Information, and for any questions, please contact the local organizing committee.


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2017 IGS Strategic Plan Now Available
February 28, 2018 • 1987 Views

The IGS Central Bureau is happy to announce that the 2017 Strategic Plan is now available for viewing and download.

In addition to its many technical projects and initiatives, the IGS maintains proactive efforts to sustainably maintain and develop the IGS organization and continuously improve its management. Starting where the 2013-2016 Strategic Plan ended, a comprehensive user community survey and strategic planning process took place in late 2016 and early 2017.

The resulting 2017 Strategic Plan has been developed in response to both the community survey responses as well as continuing key elements of the previous strategic plan’s goals and objectives. It also aims to recognize the extensive contribution of the IGS participants, and to encourage strong engagement with a broader stakeholder set that now rely implicitly on IGS products and services.

The 2017 Strategic Plan may be downloaded in single-page and two-page spread viewing formats from the IGS Knowledge Base.

Many thanks to all those who helped to develop the plan by participating in the survey and providing feedback!


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Product Access Page Updated
February 20, 2018 • 424 Views

​IGS Products have moved to CDDIS to help users gain access to over 20 years of product data. To further assist users access to this data IGS has created an “Access to Products” knowledge base article for users.


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IGS Products Generation Page Updated
February 6, 2018 • 354 Views

The IGS Products Generation page has also seen a revision and update. The page now identifies for each IGS Analysis Center, the products it currently provides, its host organization, and the name of the primary point of contact.


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2018 IGS Workshop Information
January 9, 2018 • 771 Views

The next IGS Workshop will take place from 29 October to 2 November, 2018 in Wuhan, China. Please visit the Wuhan Workshop section of the IGS Knowledge Base for the latest information and announcements.


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IGS Website, Server, FTP, and Mailing List Transitions
October 21, 2017 • 3412 Views

The final transition to igs.org from our former site, igscb.jpl.nasa.gov is now complete. Details of this transition are as follows:

Products Previously Obtained from the igscb.jpl.nasa.gov Mirror are Now Available Only from Data Centers

Please take a moment to verify that any bookmarks or automatic downloads set to igscb.jpl.nasa.gov are
updated to IGS.org addresses, or to those of the IGS Data Centers listed below.

IGS GNSS products (i.e., orbits, station positions, EOP, clock solutions) will no longer be mirrored at igscb.jpl.nasa.gov. Please see CDDIS or one of the other Global Data Centers listed below for the IGS products. CDDIS has a nice description of the product layout here.

IGS products will now only be available in subdirectories by GPS week at the following locations:

CDDIS: ftp://cddis.gsfc.nasa.gov/gnss/products/
IGN: ftp://igs.ensg.ign.fr/pub/igs/products/
SIO: ftp://garner.ucsd.edu/pub/products/

IGS Mailing Lists Have Transitioned

IGS mailing list addresses are also changing to “@lists.igs.org” because of the transition. For example, the old IGSmail address, IGSMail (at) igscb.jpl.nasa.gov, is now igsmail (at) lists.igs.org.

Please see our mailing list transition guide for details.

IGS FTP Transition

Two product directories on the old igscb.jpl.nasa.gov FTP will no longer be maintained; they are:

ftp://igscb.jpl.nasa.gov/pub/product/
ftp://igscb.jpl.nasa.gov/pub/glonass/products/

The content in these two product directories can now be found at CDDIS, IGN and SIO. Most of the remaining content on the IGS.org FTP will be maintained as it was before, with Examples of content that we will continue to maintain at the CB – now on the new IGS.org FTP – include the following:

  • IGS site logs
  • igs.snx
  • igs14.atx
  • antenna.gra
  • rcvr_ant.tab

Additionally, the maps directory will no longer be updated: ftp://igscb.jpl.nasa.gov/pub/resource/maps/

If you access these or any other IGS products through the Central Bureau FTP, please check that you are using ftp://igs.org. More information about IGS FTP sites is available on the IGS Knowledge Base.

IGS.org – Your Link to the Service

The IGS website, IGS.org, is your central source for all IGS-related updates and information. The IGS website contains the IGS Knowledge Base, which is the collective library of over 20 years of IGS-related documents and other resources. You may also view video content of IGS Workshops and other events on IGS Presents, or learn about upcoming meetings and workshops through the IGS Events calendar. The calendar is moderated by the Central Bureau, and all community members are encouraged to suggest events to be added to the calendar, via this link.

Stay Informed, Stay in Contact

Stay informed about important news announcements, such as this message, as well as IGS events, announcements, and technical information releases by subscribing to IGSmail and following IGS on social media. Major announcements and news stories will also be made available under the “News” section of the IGS homepage.

We encourage all members to recommend that their organization’s communications professionals follow the IGS social media outlets, and welcome suggestions for communications and outreach collaborations.

The Central Bureau welcomes any questions, concerns, or user feedback you may have. Please contact us at CB (at) IGS.org or using the Feedback form on the IGS website.


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IGS Associate Member Open Meeting at AGU 2017
October 17, 2017 • 868 Views

The Central Bureau is excited to be organizing the second open meeting for Associate Members and Working Group Presentations, (taking place the morning before the closed Governing Board meeting) this 10 December in New Orleans, from 9:00 AM-12:00 PM.

The agenda for this meeting will consist primarily of Working Group or Pilot Project Chairs (or designated representative) giving 5-minute reports on key issues and progress toward their Paris Workshop recommendations; followed by 3-5 minutes of discussion time.

Presentations from last year’s inaugural AM open meeting may be found on the IGS Knowledge Base: https://kb.igs.org/hc/en-us/articles/115000831828-2016-December-Associate-Member-Meeting .

If you would like to attend, please register here: https://beta.doodle.com/poll/dzceayd73ea8n2w9 Please contact the Central Bureau with any questions.

We look forward to seeing many of your in New Orleans!


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Workshop 2017 Plenaries and Posters Now Available
August 26, 2017 • 1214 Views

Workshop 2017 in Paris was a great success with over 30+ countries representing. We are proud to announce that all the videos and posters are available for everyone to view on IGS Presents.


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Mailing List Changes & Transition Details
August 10, 2017 • 866 Views

We have been in the process of migrating the IGS services to the IGS Cloud hosting platform. The last element of this is the IGS mailing list.

The mailman application is scheduled to be transitioned to the igs.org domain where eventually the igscb domain will no longer be able to receive messages. Please start using the igs.org domain email addresses as of now to assure smooth transition. Login and follow this article to get the latest updates. Please contact us to report any issues.


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New GNSS Satellite Metadata Whitepaper
July 28, 2017 • 870 Views

The IGS Multi-GNSS Working Group, led by Oliver Montenbruck, recently released a White Paper, titled “Satellite and Operations Information for Generation of Precise #GNSS Orbit and Clock Products.” As summarized by Montenbruck et. al., the paper discusses the parameters needed to ensure the highest possible performance of IGS products for all constellations and motivates the need for provision of satellite and operations information by the GNSS providers. All information requested by the IGS is considered to be sufficiently abstract such as to neither interfere with the GNSS providers’ safety and security interests nor with intellectual property rights.

The paper is now available for download on the IGS Knowledge Base.


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IGS Workshop Mini-Spotlight on Workshop Hosts
June 29, 2017 • 746 Views

The IGS 2017 Workshop in Paris, France will begin in less than a week! In this final Workshop Preview, we shine the spotlight on the workshop hosts and local organizers.

Next week’s workshop will be hosted by Institut National de l’Information Géographique et Forestière (National Institute of Geographic and Forestry Information, IGN), Centre National d’Études Spatiales (National Centre for Space Studies, CNES), and Campus Spatial of the University of Paris-Diderot. IGS Governing Board members Zuheir Altamimi (IAG Representative) and Paul Rebischung (IGS Reference Frame Coordinator), both of IGN, serve on the 2017 Workshop Local Organizing Committee. Joining them on the committee are: Felix Perosanz, of CNES; Anne Duret, Kevin Eyermann, and Xavier della Chiesa, of IGN; and Inez Burger and Lucciana Berrebi, of In2Events.

Over 250 individuals from over 30 countries around the world are expected to participate in the sessions next week. According to Altamimi, this level of participation is “testifying the large number of institutions contributing to the IGS activities, and demonstrating the importance of IGS products for science and society.”

Altamimi went on to note that IGN and CNES involvement in, and commitment to, IGS activities includes numerous GNSS stations, a Data Center maintained by IGN, and an Analysis Center operated by CNES. Furthermore, IGN hosts a Combination Center that ensures the generation of the IGS reference frame (see IGS14 announcement) along with its consistency and alignment to the International Terrestrial Reference Frame (ITRF).

The 2017 Workshop Program Booklet is now available for viewing and download. It contains a wide variety of logistical andother information in summary form.

Be sure to follow IGS Social Media to get the latest information, and use the official hashtag #IGSworkshop2017 when tweeting or posting your own news, observations, and photos.


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IGS Workshop 2017 Registration Closed
June 14, 2017 • 1898 Views

IGS Workshop 2017 registration is now closed. Due to maximum occupancy limitations of the main workshop venue, standard registration has closed early. A limited number of registrations are still available for those who are willing to view workshop presentations in an adjacent meeting room, where presentations will be projected via a live stream. These limited registrations still include the full ability to attend poster and splinter sessions. For more information, please contact the local organizing committee directly via this form.


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IGS Workshop Keynote Preview
June 2, 2017 • 926 Views
IGS Workshop Preview 2 Galileo

This year, the IGS Workshop will feature a special keynote lecture on the Galileo system, given by Marco Falcone of the European Space Agency (ESA). The keynote will address the current status of the now 18-satellite constellation, with special focus on the commissioning of the last four satellites, which were launched in November 2016. Overall system performance will also be discussed, including availability of signal in space, satellite ranging, positioning, and associated availability at the user level. Falcone will address timing performance with regard to Galileo System Time in contrast to UTC as well as GPS to Galileo Time Offset. He will also discuss the mission recovery of the GSAT201 and 202 satellites in elliptical orbit, plans for GSAT104 usage, satellite production, and the path ahead to full operation capability.

Marco Falcone currently serves as the System Manager in the ESA Galileo Project Office in Noordwijk, the Netherlands. He earned master’s degrees in Computer Science from the University of Pisa in 1987 and in Space Systems Engineering from the University of Delft in 1999. Falcone brings thirty years of large space systems engineering experience to the Galileo System Office, where he leads a dynamic team of ESA and industry personnel responsible for systems engineering, mission operations, and security efforts.

Workshop registration closes on June 16th; please visit the workshop website for more information.


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IGS 2016 Technical Report Now Available
May 17, 2017 • 992 Views

The 2016 IGS Technical Report – a comprehensive overview of the activities within the IGS – is now available for viewing and download via the IGS Knowledge Base and FTP. The report is edited by IGS Governing Board members Arturo Villiger and Rolf Dach, both of the Astronomical Institute of the University of Bern, Switzerland, who announced the publication via IGSmail-7482.


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Workshop Preview: Clocks and Timing
May 10, 2017 • 895 Views

Paris is home to the Bureau International des Poids et Mesures (BIPM), the intergovernmental organization that calculates the international reference time scale, Coordinated Universal Time (UTC), by collecting and comparing data from the world’s most accurate clocks. Since clocks and timing are critical components of space geodesy, a representative from BIPM – currently the Director of the BIPM Time Department, Felicitas Arias – sits on the IGS Governing Board. Dr. Arias has served the IGS community in this role since 2005.

IGS Clock Products and the associated Clock Products Working Group, established in 2003 after considerable joint work between the IGS and BIPM, now form a critical component of IGS Rapid and Final clock combinations.

The upcoming IGS 2017 Workshop in Paris will feature a session devoted to timing issues, co-convened by Associate Member Gérard Petit of BIPM, and IGS Clock Products Coordinator Michael Coleman of the United States Naval Research Laboratory. Presentations will include topics such as: links between the IGS and the time laboratories participating to UTC; IGS clock products and their assessment; use of IGS clock products for time and frequency transfer; calibration of geodetic time receivers; GNSS clock performance and development; and assessment of GNSS system time offsets and the interoperability of GNSS systems. There will also be a meeting of the Clock Products Working Group.

The IGS 2017 Workshop will take place 3-7 July at the University of Paris Diderot. For registration and more information about the upcoming IGS Workshop, please visit the 2017 Workshop Website. Regular updates are also posted on IGS Twitter and Facebook pages.


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Antenna Working Group Chair Transition
April 27, 2017 • 1059 Views

The IGS Antenna Working Group has announced that Arturo Villiger, of the Astronomical Institute of the University of Bern (AIUB), Switzerland, has taken over the role of Antenna Working Group Chair. He succeeds Ralf Schmid, from the German Geodetic Research Institute of the Technical University of Munich (DGFI-TUM), Germany, who led the group for over a decade.

During his tenure as Antenna Working Group Chair, Schmid pioneered absolute phase center correction modeling for testing purposes. Upon announcing his resignation from the position, Schmid noted that “New challenges are waiting for me. I would like to thank the members of the Antenna Working Group and all others that supported me over the years. It was always a pleasure to work for the IGS.”

Villiger is enthusiastic about his new position, stating that he looks forward to working with the IGS community on upcoming challenges. He noted that one of the main topics that he would like to address as working group chair is that of updating the current ANTEX format to address the needs of both the multi-GNSS community as well as calibration centers.

The IGS gratefully acknowledges the contributions of both DGFI-TUM and AIUB in ensuring that this critical role was, and continues to be, maintained for the benefit of the entire community.


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Spotlight on ESA Navigation Support Office
April 19, 2017 • 3429 Views

The European Space Agency (ESA) Navigation Support Office (NavSO), housed at the European Space Operations Centre (ESOC) in Darmstadt, Germany, generates satellite navigation products and services for ESA missions and for third-party customers, and strongly supports Europe’s global navigation satellite system programs: Galileo and the European Geostationary Navigation Overlay Service (EGNOS). In line with these activities, ESOC is a founding member of the International GNSS Service (IGS) and contributes across the full spectrum of IGS services.

As a Station-Operating Agency, the Navigation Support Office owns and operates 10 GNSS signal receivers in the IGS network and additional receivers in ESOC’s growing global GNSS sensor station network. Further, NavSO (around 30 experts) receives and processes data from over 600 stations in the IGS network to build its capabilities for providing high-accuracy navigation and satellite geodesy services. NavSO processes these data, along with data from other stations, to estimate and predict highly accurate Galileo, GPS, GLONASS, BeiDou and QZSS satellite orbits, clocks and related products – all in near-real time, 24 hours per day, year-round. These products, which make use of data made available through IGS, are then used within a variety of sophisticated applications, including scientific studies, large-scale climate monitoring, ionosphere monitoring and tracking of long-term changes in Earth’s geology.

In its role as an IGS Analysis Center, the Navigation Support Office contributes to all IGS products. In addition, NavSO actively participates in many of the IGS Working Groups, chairs the IGS Infrastructure Committee, and is home to the IGS Real Time Service (RTS) Analysis Center Coordinator. Within the RTS, NavSO generates two real-time orbit and clock solutions as well as one of the official combination products for the service. (Learn more about latest developments in the IGS Real Time Service on IGS Presents.)

By working with the IGS Real-Time Working Group, NavSO is able to play a role in formulating global open formats and standards for real time and batch GNSS processing. This is done through collaboration with the Radio Technical Commission for Maritime Services (RTCM), the leading body for differential GNSS standards and protocols. NavSO is continuing on this collaborative theme in a new initiative with the International Committee on GNSS (ICG), which will see NavSO serve as the Analysis Center Coordinator for the International GNSS Monitoring and Assessment (IGMA) activity.

Beyond navigation satellites, NavSO is a leading European center for the precise orbit determination (POD) of satellites in low Earth orbit (LEO) and medium Earth orbit (MEO). This orbit determination is achieved primarily using GNSS measurements, augmented by satellite laser ranging (SLR), Doppler measurements from the French DORIS system and altimetry measurements. Centimeter-level accuracies are possible using a fusion of these measurement types, an analysis made possible by specialized software developed within NavSO. In this context, IGS data is currently used and products from the IGS Real-Time Service are foreseen to be incorporated.

With these and many other activities, participation in the IGS helps ESA’s Navigation Support Office in its mission to be at the forefront of space-based navigation.

IGS Spotlights are a collaborative effort between the IGS Central Bureau and IGS contributing organizations. The Central Bureau gratefully acknowledges the collaboration and contribution of the ESA Navigation Support Office, led by IGS Governing Board member Prof. Dr. Werner Enderle, as well as Daniel Scuka of the ESA Communication Department and Adam Vigneron of the ESA ESOC NavSO.

Image: ESA’s satellite operations control facilities include the Main Control Room at ESOC in Darmstadt, Germany (shown here), dedicated control rooms for specific missions and Estrack, the worldwide ground tracking station network. Credit: ESA/J. Mai

IGS Spotlight profiles the activities of different components of, and contributors to, the IGS. If you would like your organization, group, or project profiled in an IGS Spotlight, please contact us.

Please include the IGS logo and citation in all websites, presentations, publications, or posters that use IGS data, products, or services. The IGS is a service of the International Association of Geodesy.

For more updates on the IGS and its components, please follow us on social media.


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IGS invites authors and editors to contribute
March 24, 2017 • 721 Views

The IGS invites authors and editors to visit the IGS Library in the geodetic community who are publishing a scholarly publication, presentation, poster, pamphlet, or anything else citing the IGS or referring to IGS products and services, to please send the citation – in BibTex format – to cb@igs.org. Selected publications may be featured in the IGS News Feed.

Please include full references, abstracts, and the web address of the document, if available. If you are unfamiliar with the BibTex citation format, please use a program such as BibDesk and JabRef to create a compatible citation.


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MGEX Achievements, Prospects, and Challenges
March 14, 2017 • 1050 Views

As announced by Oliver Montenbruck in IGSmail-7446, the IGS Multi-GNSS Experiment has recently published a comprehensive paper detailing its achievements in the last five years, future prospects, and challenges. The article, published in Advances in Space Research, Volume 59, Issue 7, 1 April 2017, Pages 1671–1697, discusses the multi-GNSSproducts derived from the IGS monitoring station network as well as progressmade within the MGEX project to include BeiDou, Galileo, and QZSS for precise point positioning, atmospheric research, and other applications.

The article is available in its entirety until April 25, 2017 via the provided by Montenbruck in IGSmail-7446. Due to copyright restrictions, a pre-print previous version of the article is available in the IGS Knowledge Base.

Please also contribute to the IGS Library with your scholarly publication, presentation, poster, pamphlet, or anything else citing the IGS or referring to IGS products and services.


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IGS Workshop 2017 - Registration Now Open
March 7, 2017 • 4276 Views

Registration for the 2017 IGS Workshop is now open at http://igsworkshop2017.ign.fr/. Early bird discount for limited time is available until May 05, 2017. Abstract submissions for oral and poster sessions is May 05, 2017. LOC email address locigsworkshop2017 at ign.fr #igsworkshop2017


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RINEX 3.03 Update 1 Now Available
March 7, 2017 • 1541 Views

The IGS RINEX Working Group recently announced the release of documents detailing the RINEX 3.03 Update 1. The document, along with a full description of the release notes, is available on the IGS Knowledge Base.

Receiver Independent Exchange Format (RINEX) is a data interchange format for raw satellite navigation data, enabling users to post-process the received data themselves, as needed for optimal results. It is
considered the standard for storing all data needed for GNSS positioning and navigation, providing a means to seamlessly store data transmitted from the GNSS and GEO/SBAS satellites, as well as meteorological data and fundamental observations made by GNSS receivers.

The first proposal for RINEX was developed by the Astronomical Institute of the University of Bern for the easy
exchange of the GPS data to be collected during the first large European GPS campaign EUREF 89. RINEX version 1 was introduced in 1989, with version 2, which added the possibility to include tracking data from systems such as GLONASS and SBAS, in 1990.

Release of RINEX version 3 was developed partially in response to the introduction of Europe’s Galileo, as well as enhanced GPS with new frequencies and observation types. Additional version 3 sub-versions included support for Japan’s QZSS, additional information on China’s BeiDou, enumeration of Russia’s GLONASS code phase biases, requirements for generation of consistent phase observations across different tracking modes, and unofficial space-borne receiver definitions used in RINEX 2.20. RINEX 3.03 was developed to build upon this by adding support for India’s IRNSS, new BeiDou B1 signal conventions, and other improvements.

Due to the wide industrial use of RINEX, its development is managed jointly by the IGS and Radio Technical Commission for Maritime Services-Special Committee 104 (RTCM-SC104). The IGS RINEX Working Group was established in December of 2011 to update and maintain the RINEX format to meet the needs of the IGS and the GNSS industry Learn more about this in the IGS Knowledge Base.


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GGOS Session at EGU 2017 General Assembly
March 6, 2017 • 685 Views

As a service of the IAG, the IGS will be participating in the upcoming GGOS session, taking place at the EGU General Assembly in Vienna, Austria:

G2.1 - The Global Geodetic Observing System: Improving Today’s Infrastructure for Tomorrow’s Science

Convener: Günter Stangl
Co-Conveners: Detlef Angermann , Michael R. Pearlman , Richard Gross
Oral / Tue, 25 Apr, 08:30–10:00 / Room K1
Poster / Attendance Tue, 25 Apr, 17:30–19:00 / Hall X3

For more information, please visit the EGU website: http://ow.ly/JtlR309DEPb

Be sure to follow IGS on social media for more information and updates: http://www.igs.org/social


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Spotlight on Geoscience Australia
February 23, 2017 • 6414 Views

Australia: A Continent on the Move

Did you know that Australia sits on one of the Earth’s fastest moving tectonic plates and is moving north east by approximately seven centimeters a year? Australian scientists are working on moving Australia’scoordinate reference frame, the Geocentric Datum of Australia 1994 (GDA94) to reflect our actual position in the world. The GDA94 underpins all spatial data and mapping in Australia, and ensures access to the most accurate location-based data available. This is significant when it comes to the use of equipment or spatial data that relies on accurate positioning data.

IGS contributing organisation Geoscience Australia is the Australian Government science body responsible for developing and maintaining the Geocentric Datum of Australia, and ensuring it is of the highest technical quality achievable. As of January 2017, tectonic movement has offset the current Geocentric Datum of Australia 1994 (GDA94) by about 1.6 meters from the International Terrestrial Reference Frame (ITRF). Geoscience Australia is working with state and territory governments and academic institutions to define the new datum, which will be called the Geocentric Datum of Australia 2020 (GDA2020) and will be implemented in 2017.

Using the IGS Network, Products, and Data to Enable Precise Measurements

To best assess changes in the Earth’s surface caused by tectonic forces, crustal deformation is measured daily using precise GNSS data. Geoscience Australia obtains this data from a network of over 600 global and national GNSS stations, including the Enable Precise Measurements IGS Network Stations.Geoscience Australia uses a combination of IGS products and data, including regional and Australian GNSS data collected over the last over 20 years and the Bernese GNSS software developed by the Astronomical Institute of the University of Bern (another member of the IGS community), to measure the change in position due to crustal motion. From this information, they are able to derive the new coordinate datum, bringing it into alignment with ITRF2014 at epoch 2020. This new datum will ensure that Australian Spatial data can be used with online digital maps and GNSS positioning which are both ITRF based, ultimately enabling developments such as safe and accurate autonomous vehicles.

In addition to secular tectonic motion, Geoscience Australia also uses IGS network, products and data to measure the internal deformation of the Australian Plate, enabling seismologists to further understand earthquakes within Australia. This is supported by the AuScope GNSS network, which makes an additional 100 GNSS stations accessible to the international geospatial research community – including the IGS. While the AuScope network is not included in the IGS network, the sites are built to comply with IGS site guidelines, ensuring the data from these sites is suitable for use in Earth science research. The information derived from these collaborative efforts will ultimately support the development of improved earthquake and tsunami risk mitigation procedures, as well as updating building codes in Australia.

IGS Antenna Calibration Facility at Geoscience Australia in Canberra

Geoscience Australia’s GNSS antenna calibration facility was built to enable even more accurate measurements of crustal deformation, and to contribute to the global IGS Enable Precise Measurementscommunity through the development of better antenna models. These models are required because every antenna, due to manufacturing imperfections, has small biases which can accumulate over time – severely impacting the accuracy of measurements.

By working with the IGS community, especially the IGS Antenna Working Group, as well as cross-comparing calibration analysis results with other facilities globally, Geoscience Australia ensures its results are world-class and provide the best possible antenna resources to the IGS Network.

*IGS Spotlight profiles the activities of different components of, and contributors to, the IGS. If you would like your organization, group, or project profiled in an IGS Spotlight, please contact us.


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IGS14 Reference Frame Transition
February 7, 2017 • 4570 Views

By Paul Rebischung (IGN), Ralf Schmid (DGFI-TUM), and Allison Craddock (NASA JPL, IGS Central Bureau)

The International GNSS Service (IGS) recently adopted a new reference frame, called IGS14, on 29 January 2017 (GPSWeek 1934). At the same time, an updated set of satellite and ground antenna calibrations, igs14.atx, was implemented. The switch from IGb08/igs08.atx to IGS14/igs14.atx was announced with IGSMAIL-7399 on 21 December 2016 by representatives of the IGS Reference Frame and Antenna Working Groups, as well as the Analysis Center Coordinator.

IGS14 is the latest in a series of GNSS reference frames adopted by the IGS. These reference frames form the basis of the IGS products, and are derived from each new version of the International Terrestrial Reference Frame. Updating to IGS14 will align IGS products to ITRF2014, and increase precision of that alignment by integrating additional available reference frame stations with more precise and up-to-date coordinates.

Antenna calibration updates in igs14.atx include robot calibrations for additional ground antenna types, increasing the percentage of ground stations in the IGS network with absolute calibrations to over 90%. This will result in increased coordinate accuracy for stations equipped with these antennas.

Both GPS and GLONASS satellites, in particular those launched since September 2012, have also experienced antenna calibration updates which (in the case of recently launched satellites) will replace the preliminary block-specific values in igs08.atx with new satellite-specific estimates. With this, the scale of the IGS daily terrestrial frame solutions will increase in stability and become closer to that of the ITRF.

SINEX and ANTEX files, as well as network maps, post-seismic deformation models, and offsets are available for download via ftp from Institut National de l’Information Géographique et Forestière (National Institute of Geographic and Forestry Information, IGN) and École Nationale des Sciences Géographiques (National School of Geographic Sciences, ENSG).

The IGS cumulative solution will also be updated during GPS Week 1934, incorporating combined repro2 (ig2) and operational (igs) solutions, as well as a revised discontinuity list that is aligned with ITRF2014, plus the ITRF2014 post-seismic deformation models. This will be released mid-February.

For more information, please see [IGSMAIL-7399] “Upcoming switch to IGS14/igs14.atx.”and “IGS14/igs14.atx: a new framework for the IGS products.”


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Geodesy schedule for the AGU 2016 Fall Meeting Posted
November 18, 2016 • 931 Views

The #Geodesy schedule for @theAGU #FallMeeting has been posted, with many presentations and posters from IGS members. Please visit the AGU schedule page for more information: ow.ly/Aafm305iS5m


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IGS Workshop 2017 - Paris, France July 3-7, 2017
September 8, 2016 • 1295 Views

Please save the dates for the next IGS Workshop to be hosted by the Institut National de l’Information Géographique et Forestière (IGN) in Paris, France, July 3-7, 2017.

Information will be posted here plans develop.


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CFP: GNSS Performance Monitoring IGMA-IGS Joint Trial Project
August 24, 2016 • 3986 Views

The GNSS Performance Monitoring IGMA-IGS Joint Trial Project is a joint activity of GNSS Providers and the IGS being organized through the UNOOSA/International Committee on GNSS. The Project is aimed at creating an authoritative international GNSS monitoring and assessment system with results trusted by all parties and worldwide. IGS participation within the Joint Trial Project is being solicited through this Call for Participation.


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Disaster Management and Recovery Framework
August 6, 2016 • 837 Views

Watch the video presentation of Disaster Management & Recovery Framework: The Surveyors Response presented by Greg Scott at the 78th Fig Working Week in 2016 about how United Nations Geo-response to disaster management. The impact on and the challenges ahead for the surveying and geospatial professional.

Greg Scott leads the Secretariat for the United Nations Committee of Experts on Global Geospatial Information Management (UN-GGIM), providing strategic policy advice and leadership in the coordination and implementation of UN-GGIM initiatives with Member States and related International Organizations involved in national, regional and global geospatial information management.


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IGS Technical Report 2015
June 29, 2016 • 3138 Views

Applications of the Global Navigation Satellite Systems (GNSS) to Earth Sciences are numerous. The International GNSS Service (IGS), a voluntary federation of government agencies, universities and research institutions, combines GNSS resources and expertise to provide the highest–quality GNSS data, products, and services in order to support high–precision applications for GNSS–related research and engineering activities.

This IGS Technical Report 2015 includes contributions from the IGS Governing Board, the Central Bureau, Analysis Centers, Data Centers, station and network operators, working groups, pilot projects, and others highlighting status and important activities, changes and results that took place and were achieved during 2015.


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CFP GNSS Augmentation to the Tsunami Early Warning System
April 17, 2016 • 761 Views

This is a Call for Participation to research scientists, geodetic research groups and national agencies in support of the implementation of the recommended Global Navigation Satellite System (GNSS) Augmentation to Tsunami Early Warning Systems (GATEW). The call seeks to establish a working group to be a catalyst and motivating force for the definition of requirements, identification of resources, and for the encouragement of international cooperation in the establishment, advancement, and utilization of GNSS for Tsunami Early Warning.


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Workshop 2016 Plenary and Posters Available
March 24, 2016 • 703 Views

All the #igsworkshop2016 plenary video presentations with their slides are now available at IGS Presents.


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Sea-level change: A scientific and social challenge for the 21st century
March 22, 2016 • 747 Views

Learn more about how IGS helps sea-level change analysts like John Church watch his presentation.


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IGS Workshop 2014 - Celebrating 20 Years!
March 16, 2016 • 958 Views

We are pleased to announce—the IGS 2014 20th Anniversary Workshop Website is now available! http://www.igs.org This should be a memorable meeting, and already a very interesting program and schedule is in place, as you will see at the website!

For those of you needing a US entry visa ­ please see the instructions at the website, and we will prepare the invitation letters in a very timely manner.

Many thanks to Rolf Dach, Astronomical Institute, University of Bern, Chair of the IGS 2014 Scientific Committee; our local organizing committee, the IGS Central Bureau; and to each of you - who, for so many years, contribute to concrete developments, exponential advances, and a true sense of a global community.

And -

Please note: the IAG/GGOS/IERS Unified Analysis Workshop (UAW) will be held in conjunction & following the IGS Workshop - at Caltech, June 27 & 28. More details on this invitation only event will follow, but all local logistics apply, and there is a separate registration fee for those attending just the UAW.

We are looking forward to welcoming you to Pasadena in June!


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Properly Naming your Rinex 3 files
January 27, 2016 • 1161 Views

To all station data providers currently providing Rinex 3 files as part of the IGS network. Please at your earliest convenience implement the correct naming scheme for your Rinex 3 files as the old Rinex 2 names for Rinex 3 files are no longer appropriate.

Enclosed in the pdf is a set of recommendations that you may findEnclosed in the pdf is a set of recommendations that you may find useful, but many different organizations have implemented their own renaming methods, and some vendors already allow correct naming of Rinex 3 files but clearly not all so some action from Station Operators is needed.

The Rinex 3 format clearly defines the new naming structure: https://kb.igs.org/hc/en-us/articles/206482558-RINEX-3-03

To find your “IGS station long name” go to http://igs.org/network click on “options” , and in the first column “Site” select the checkbox “Long Name” to show the name expected by the IGS for all stations. If you disagree with the country code in the Long Name assignment please inform us quickly so as to avoid confusion, for now all stations have “00” for receiver and antenna.

Again this affects only Rinex 3 Station Data Providers (previously “MGEX stations”, now called “multi-GNSS stations”) .

The data files acceptable for the IGS continues to be; Daily (30sec), Hourly (30 sec) and Highrate (1sec) 15 min files. The “expected” name is assumed, if you have doubts please let us know. If you base your long name on the current filenames you are delivering as part of “mgex” then the name will be fine. Rinex 3 filenames are very flexible for the benefit of the entire GNSS community, but the IGS will not be taking advantage of that full flexibility.

RINEX 3 file deliveries with the old names can be discontinued if you want, once you have implemented the new filenames, but they will continue to be accepted in parallel for six months if you want to continue to submit them and will be stored as always in the /mgex campaign directories in the different IGS Data Centers. RINEX 3 files with the correct long names will be merged into the regular IGS GNSS data repository together with the Rinex 2 data, and you can see them in there since the start of 2016.

Rinex 2 files with their standard names can be submitted in parallel to Rinex 3 files for as long as you want, as they may serve different communities, all RINEX files will now be stored together for easier access and “discoverability” by all GNSS data users.


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ITRF 2014 Now Available
January 21, 2016 • 3570 Views

The ITRS Center at IGN has the pleasure to announce to the community theavailability of the ITRF2014 solution at the dedicated web site:

http://itrf.ign.fr/ITRF_solutions/2014/

I want to take this opportunity to acknowledge the enormous efforts of theTechnique Services (IVS, ILRS, IGS, IDS) and their Analysis and CombinationCenters for their contributions by providing reprocessed solutions.The quality of the ITRF2014 is certainly benefiting from these techniqueimproved solutions. Many thanks to a number of institutions and individualsfor their contributions to the ITRF2014 project.I want also to acknowledge the contribution of DGFI and JPL colleagues, aswell as my colleagues at the ITRS Center: IGN Geodetic Research Laboratory(LAREG) and IGN Survey Department (SGN).

The ITRF2014 web site contains the most important results and informationregarding the ITRF2014 combination. It will be updated regularly to add moredetails and results useful to the ITRF users.

For any comment, question or specific request, please contact:itrf at ign.fr

Cordially

Zuheir Altamimi

Head, ITRS Center


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IGS ACC Transition to GA/MIT
January 14, 2016 • 955 Views

On Thursday January 14, 2016, the role and operational data processing for the IGS Analysis Center Coordinator (ACC) will transition from NOAA/NGS to a combined role for Geosciences Australia (GA) and MIT. The operational data processing to generate the IGS ultrarapid, rapid, and final orbit and clock products will be carried in a cloud computing environment sponsored by GA. The operational oversight of product quality and generation will be split between GA and MIT depending on time day. The new system has been running in parallel for the past two months and has been generating results that are fully consistent with the NOAA/NGS operational processing.

For users and analysis centers, there should be no apparent changes after the transition. All the products are available from and deposited to the same locations as currently. While it is expected that the transition should happen transparently, there could be some delays as the new team works through any problems that do arise. Kevin Choi at NOAA/NGS has graciously agreed to continue his assistance during the transition and the new team is very thankful for this.

Finally the GA/MIT team would like to thank the NOAA/NGS team for the tireless efforts over the last 8 years as IGS ACC. The efforts of Jim Ray, Jake Griffins and Kevin Choi are very appreciated.

Questions can be sent to acc at igs.org

Complaints can be sent to Gary.Johnston at ga.gov.au

(just kidding, won’t be in message).

GA/MIT Team, Michael Moore, Guorong Hu, Mike Floyd, Tom Herring.


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2015 Technical Report Contributions Due
November 16, 2015 • 830 Views

We appreciate your interest and valuable contributions to the reportagain. The next report, IGS Technical Report 2015, is scheduled to be published at the beginning of 2016.

The deadline for submissions is January 31, 2016.

In agreement with the previous IGS Technical Reports, the issue for 2015 must contain contributions from the main components of the IGS, namely global analysis centers (ultra rapid, rapid and final products), the global data centers, the working groups, and the pilot projects.

Contributions from associated analysis centers, regional data centers, and other IGS related organizations are welcome as well.


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2016 Workshop Registration Open
October 6, 2015 • 872 Views

The website for the 2016 IGS Workshop is now live: http://igsworkshop2016.org

Registration is now open and includes an early bird discount rate for registrations before January 1, 2016. Registration includes admission to the Wednesday night dinner and a cruise on Sydney Harbour. A skeleton program has been drafted and information on how to submit an abstract for both oral and poster sessions is available. It is advised that attendees apply for Visa’s as early as possible, information is available on the website. If you have any questions or would like further information, please contact the local organizing committee by emailing IGSWorkshop2016@ga.gov.au


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Guide to Using IGS Products Updated
September 17, 2015 • 1020 Views

Since 1994, the International GNSS Service (IGS) has provided precise GPS orbit products to the scientific community with increased precision and timeliness. Many national geodetic agencies and GNSS (Global Navigation Satellite System) users interested in geodetic positioning have adopted the IGS precise orbits to achieve centimeter level accuracy and ensure long-term reference frame stability. Relative positioning approaches that require the combination of observations from a minimum of two GNSS receivers, with at least one occupying a station with known coordinates are commonly used. The user position can then be estimated relative to one or multiple reference stations, using differenced carrier phase observations and a baseline or network estimation approach. Differencing observations is a popular way to eliminate common GNSS satellite and receiver clock errors. Baseline or network processing is effective in connecting the user position to the coordinates of the reference stations while the precise orbit virtually eliminates the errors introduced by the GNSS space segment. One drawback is the practical constraint imposed by the requirement that simultaneous observations be made at reference stations. An alternative post-processing approach uses un-differenced dual-frequency pseudorange and carrier phase observations along with IGS precise orbit products, for stand-alone precise geodetic point positioning (static or kinematic) with centimeter precision. This is possible if one takes advantage of the satellite clock estimates available with the satellite coordinates in the IGS precise orbit/clock products and models systematic effects that cause centimeter variations in the satellite to user range. Furthermore, station tropospheric zenith path delays with mm precision and GNSS receiver clock estimates precise to 0.03 nanosecond are also obtained. To achieve the highest accuracy and consistency, users must also implement the GNSS-specific conventions and models adopted by the IGS. This paper describes both post-processing approaches, summarizes the adjustment procedure and specifies the Earth and space based models and conventions that must be implemented to achieve mm-cm level positioning, tropospheric zenith path delay and clock solutions.


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Release of RINEX Version 3.03
August 5, 2015 • 2084 Views

The IGS and RTCM-SC104, RINEX Working Group would like to announce the release of RINEX 3.03. Major RINEX 3.03 Changes: Added the Indian Regional Navigation Satellite System (IRNSS). Updated the IONOSPHERIC CORR record format and specification. Updated the LEAP SECONDS record format and specification. Updated the TIME SYSTEM CORR record format and specification. Changed the BeiDou B1 observation codes back to the RINEX 3.01 convention. Clarified the GPS Navigation message fit interval (time period in hours). Clarified the QZSS Navigation message fit interval (a flag (0/1)). Updated the document to more clearly indicate that only known tracking modes are supported in SYS/#/OBS TYPES records and RINEX 3.03. Updated Section 8.3.2 and Appendix A8 BROADCAST ORBIT-5 to clarify the use of the Issue of Data(IOD) parameter in I/NAV and F/NAV messages. Added several sample data formats to the Appendix. Updated text to allow unknown GLONASS COD/PHS/BIS message definition. Clarified that the GLONASS SLOT / FRQ# message is mandatory


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Multi GNSS Antenna Phase Center Model Introduced
July 21, 2015 • 778 Views

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43 MGEX Stations Added to IGS Network
July 15, 2015 • 837 Views

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2014 IGS Technical Report
May 15, 2015 • 3892 Views

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2015 Strategic Implementation Plan
January 1, 2015 • 785 Views

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Gary Johnston of Geoscience Australia elected Chair of IGS Governing Board
December 22, 2014 • 972 Views

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IGS 2013 Progress Dashboard
October 7, 2014 • 1529 Views

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2014 Workshop Compendium
July 13, 2014 • 3047 Views

The IGS is pleased to announce upcoming IGS Workshop – Celebrating 20 Years of Service. This five-day workshop will bring scientists, engineers, and geodesists from all over the world to the campus of California Institute of Technology (Caltech) at 1200 E California Blvd, Pasadena, California 91125, United States for a week of presentations, discussions, and meetings. The workshop will be composed of plenary sessions with invited oral presentations, three poster sessions, and numerous working group splinter meetings, multiple splinter meetings, and other noteworthy events.


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Second IGS Reprocessing Campaign (Repro2)
May 30, 2014 • 744 Views

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2014 Strategic Implementation Plan
May 21, 2014 • 1552 Views

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IGS MGEX Introduced
April 23, 2014 • 3802 Views

With four new and emerging constellations (BeiDou, Galileo, QZSS, IRNSS) as well as the ongoing modernization of the U.S. Global Positioning System and Russia’s GLONASS, the world of satellite navigation is undergoing dramatic changes. Facing these challenges, the International GNSS Service has initiated the Multi-GNSS Experiment to enable an early familiarization with the new systems and to prepare their incorporation into high-precision GNSS modeling and analysis. This article reports on the status of the new constellations and the MGEX project and describes initial data products and recent results for individual systems.


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IGS Strategic Plan 2013-1016
February 21, 2014 • 1586 Views

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IGS becomes a Network Member of ICSU World Data System
January 23, 2014 • 682 Views

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IGS 2012 Workshop Recommendations
July 13, 2013 • 802 Views

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IGS Progress Report
April 23, 2013 • 3867 Views

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IGS Real-Time Services
April 1, 2013 • 3980 Views

The International GNSS Service (IGS) has ensured the availability of open access, high-quality GNSS data products since 1994. These products enable access to the definitive global reference frame for scientific, educational, and commercial applications – a tremendous benefit to the public.

Through the Real-time Service (RTS), the IGS extends its capability to support applications requiring real-time access to IGS products. RTS is a GNSS orbit and clock correction service that enables precise point positioning (PPP) and related applications, such as time synchronization and disaster monitoring, at worldwide scales. RTS is based on the IGS global infrastructure of network stations, data centers and analysis centers that provide world standard high-precision GNSS data products.

The RTS is currently offered as a GPS-only beta service for the development and testing of applications. The Russian GLONASS is initially provided as an experimental product and will be included within the service when the RTS reaches its full operating capability at the end of 2015. Other GNSS constellations will be added as they become available.

This service is made possible through partnerships with Natural Resources Canada (NRCan), the German Federal Agency for Cartography and Geodesy (BKG), and the European Space Agency’s Space Operations Centre in Darmstadt, Germany (ESA/ESOC). Support is provided by 160 station operators, multiple data centers, and 10 analysis centers around the world.

The RTS is operated by the IGS as a public service. Users are offered open and readily available access through subscription.


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IGS 2012 Technical Report
April 1, 2013 • 2331 Views

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IGS Site Guidelines
April 1, 2013 • 556 Views

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IGS Director Ruth Neilan receives Levallois Medal by the IAG Past President Gerhard Beutler
September 6, 2012 • 776 Views

IGS Director Ruth Neilan receives Levallois Medal by the IAG Past President Gerhard Beutler.


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Guidelines for IGS Technical Report 2012
September 1, 2012 • 482 Views

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2012 IGS Workshop
July 1, 2012 • 3854 Views

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2012 IGS Strategic Implementation Plan
July 1, 2012 • 766 Views

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2011 IGS Technical Report
July 1, 2012 • 3885 Views

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Welcome to IGS Presents
April 9, 2012 • 3910 Views

Welcome to IGS Presents. Videos. Presentations. Posters. Images. Exclusive content by leaders of the community.


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PPP-RTK & Open Standards Symposion and Workshop
March 1, 2012 • 783 Views

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IGS Workshop on GNSS Biases 2012
October 1, 2011 • 1551 Views

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IGS Central Bureau is now an NTRIP Caster!
October 1, 2011 • 747 Views

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IGS M-GEX Response Form
October 1, 2011 • 3076 Views

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IGS M-GEX - Call for Participation - New Information
October 1, 2011 • 747 Views

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2012 IGS Workshop - 1st announcement
September 1, 2011 • 1022 Views

On behalf of the local organising committee I would like to give you advance notice of the IGS AC Workshop 2012 to be held July 23-27, 2012 at the University of Warmia and Mazury (UWM) in Olsztyn, Poland. The meeting will hosted by the Department of Astronomy and Geodynamics of UWM, with the local organizing committee led by Andrzej Krankowski (kand at uwm.edu.pl). Shailen Desai (shailen.d.desai at jpl.nasa.gov; JPL) will serve as scientific programme organiser for the workshop. Please reserve these dates on your calendar so that we have a well-attended and productive workshop. A web site providing details about the workshop will be available in September. If you have any comments or suggestions on the scientific content or organisation aspects of the workshop please contact Shailen or Andrzej, respectively. We look forward to seeing you in Olsztyn! - Andrzej Krankowski


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IGS08 Realization adopted
April 1, 2011 • 3100 Views

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IGS Strategic Implementation Plan - 2011
March 1, 2011 • 692 Views

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IGS 2010 Workshop Presentation Videos
June 1, 2010 • 718 Views

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IGS 2010 Workshop Presentation Photos
June 1, 2010 • 711 Views

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IGS Workshop, 28 Jun - 2 July, Newcastle upon Tyne, Englane
June 1, 2010 • 806 Views

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IGS Strategic Plan - 2010
June 1, 2010 • 3830 Views

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IGS Workshop 2010 Announced
February 12, 2010 • 1626 Views

The 2010 workshop of the International GNSS Service (IGS) will be held at Newcastle upon Tyne (UK) 28 June - 1 July, followed on 2 July by a one-day symposium on vertical rates from GNSS. Please consult the website for the IGS Workshop programme, registration form and abstract submissions. Travel information and accommodation booking is also provided.The workshop is open to the entire community and will feature invited talks, posters, and splinter meetings on a full range of issues important to IGS activities: monumentation, station integrity, data transmission and storage, analysis center activities, antenna and receiver calibrations, troposphere and ionosphere modeling and products, modeling of station and satellite motions, and requirements for new applications. See igsmail for details


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New Reference Frame Coordinator
February 1, 2010 • 1561 Views

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Multi-GNSS Asia - 25-26 January 2010, Sofitel Centara Hotel, Bangkok, Thailand
October 1, 2009 • 925 Views

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IGS Guidelines Updated
October 1, 2009 • 506 Views

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IGS Infrastructure Committee introduced
September 1, 2009 • 762 Views

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Third Meeting of the International Committee on GNSS - ICG 3
December 1, 2008 • 682 Views

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AGU Fall Meeting 15-19 December, San Francisco, CA, USA
December 1, 2008 • 812 Views

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IGS Workshop 2-6 June, Miami Beach, Florida, USA
June 1, 2008 • 746 Views

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Photo Gallary Added
June 1, 2008 • 3837 Views

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Real Time Pilot Project Call for Participation issued
June 1, 2007 • 736 Views

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A one-page printable information sheet is available in the publications area
May 1, 2006 • 688 Views

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IGS Workshop 8-12 May, Darmstadt
March 10, 2006 • 1589 Views

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Information on the change to spec format for IGS orbits
January 25, 2006 • 615 Views

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IGSMail announcement
October 21, 2005 • 3760 Views

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CFP in the Unification of African Reference Frames - ‘Project AFREF’ avialble
October 21, 2005 • 634 Views

The Call for Participation in the Unification of African Reference Frames - ‘Project AFREF’ - is available


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The IGS FAQ has been extensively revised
June 1, 2005 • 750 Views

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IGS now officially stands for the International GNSS Service
March 17, 2005 • 672 Views

The IGS Terms of Reference and several Policy and Charter documents have been updated. IGS now officially stands for the International GNSS Service. This change reflects the IGS’ incorporation of GLONASS, and interest in future GNSS such as Galileo.


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Performance analysis summary of determiningthe GPS satellites’ orbits
January 13, 2005 • 663 Views

A summary of how well the most recent IGS analysis was able to determine the GPS satellites’ orbits is available.


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Overlapping period of orbits in sp3 and sp3c formats provided until September 2005
November 8, 2004 • 821 Views

The overlap period during which the IGS will provide orbits in sp3 and sp3c formats will continue until September, 2005. After that, IGS orbits will be provided in sp3c format. Update your software accordingly! More information and links to the format specifications are available here


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2001-02 Annual Report available
October 5, 2004 • 800 Views

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Information on switch to sp3c updated
August 30, 2004 • 722 Views

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IGSStation mailing list split off from IGSMail. See IGSMail 4921
April 14, 2004 • 604 Views

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IGS Site Guidelines and new site Checklist available
April 14, 2004 • 451 Views

IGS Site Guidelines and new site Checklist, available via the network page reflect the new IGSStation list.


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The Proceedings of the 2002 Ottawa “Towards Real-Time” workshop is now available electronically
November 10, 2003 • 723 Views

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Please include the IGS logo and citation in all websites, presentations, publications, or posters that use IGS data, products, or services. IGS is a service of IAG.