GGOS SC 14 San Francisco 2008 Formal international recognition of the International Terrestrial...
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![Page 1: GGOS SC 14 San Francisco 2008 Formal international recognition of the International Terrestrial Reference System (ITRS) Claude Boucher Pascal Willis.](https://reader036.fdocuments.in/reader036/viewer/2022083005/56649f2a5503460f94c44179/html5/thumbnails/1.jpg)
GGOS SC 14 San Francisco 2008
Formal international recognition of the International Terrestrial Reference System (ITRS)
Claude Boucher
Pascal Willis
![Page 2: GGOS SC 14 San Francisco 2008 Formal international recognition of the International Terrestrial Reference System (ITRS) Claude Boucher Pascal Willis.](https://reader036.fdocuments.in/reader036/viewer/2022083005/56649f2a5503460f94c44179/html5/thumbnails/2.jpg)
GGOS SC 14 San Francisco 2008
Context• ITRS was defined in 1988 within the IERS
community and made available through its primary realizations (ITRF solutions)
• The geoscience international scientific community formally adopted it (IUGG resolution, Perugia 2007)
• The IAG services, in particular IGS, express their products in ITRS by using directly ITRF solutions.
• Regional networks (CORS, EUREF, AFREF…) are also realizations of ITRS for a geographical area.
![Page 3: GGOS SC 14 San Francisco 2008 Formal international recognition of the International Terrestrial Reference System (ITRS) Claude Boucher Pascal Willis.](https://reader036.fdocuments.in/reader036/viewer/2022083005/56649f2a5503460f94c44179/html5/thumbnails/3.jpg)
GGOS SC 14 San Francisco 2008
• The GNSS community provides more and more services also directly expressed in ITRS. GPS and Galileo standard services are in such a case (US-EU agreement)
• This implies that TRF information for WGS84 is recognized as a particular realization of ITRS
• Nevertheless, for a variety of reasons, several other system designations are adopted in regulations or standards, in various communities:– WGS84 for ICAO, IAC, IHO– ETRS89 for EUREF, EuroGeographics and INSPIRE
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GGOS SC 14 San Francisco 2008
Findings• Up to now, ITRS is formally adopted only by the
geoscience community• Among several communities of practice
(navigation, hydrography, geo-information…), various texts, recommendations or standards refer to multiple TRS designations in addition to ITRS, such as WGS84, ETRS89..whiich creates potential confusions
• The existence, quality, perenity or reliability of ITRS realizations are presently ensured by various scientific groups or even individuals, without unified and inter-governmental guarantee
![Page 5: GGOS SC 14 San Francisco 2008 Formal international recognition of the International Terrestrial Reference System (ITRS) Claude Boucher Pascal Willis.](https://reader036.fdocuments.in/reader036/viewer/2022083005/56649f2a5503460f94c44179/html5/thumbnails/5.jpg)
GGOS SC 14 San Francisco 2008
Proposals• 1:To establish a new ISO standard which will endorse
the ITRS as the unique preferred terrestrial reference system for all domains of activity
• 2:To establish an international and inter-governmental governing structure which ensures the existence , quality , consistency and perenity of the various realizations of ITRS
• 3:To ensure the proper clarifications in terminology and explanations of ITRS with regard to other terms such as WGS84, ETRS89
![Page 6: GGOS SC 14 San Francisco 2008 Formal international recognition of the International Terrestrial Reference System (ITRS) Claude Boucher Pascal Willis.](https://reader036.fdocuments.in/reader036/viewer/2022083005/56649f2a5503460f94c44179/html5/thumbnails/6.jpg)
GGOS SC 14 San Francisco 2008
Proposal 1 ISO Standard
• Content of the standard– Proper level of detail– Compatible with current activities (ITRF, regional
networks, GNSS, WGS…)
• Procedure of establishment– Link with existing ISO TCs– ISO member country to act as secretary (France
possible candidate)– International support (GGOS, BIPM…)
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GGOS SC 14 San Francisco 2008
Proposal 2 Governance
• Three tracks:
• a) to create a body related to an existing UN organization
• b) to create a body related to an inter-governmental agreement, such as the General Conference on Weights and Measures (CGPM), with potential involvement of BIPM
• c) to create a new body through an ad hoc international agreement, possibly in the frame of GEO
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GGOS SC 14 San Francisco 2008
Proposal 3 Interoperability
• WGS84: To view WGS84 as the cover name of a specific realization of ITRS. This should be accepted by the satellite navigation community (the ICG mentioned before should play the leading role), civil aviation (ICAO), hydrography (IHO), cartography and geo-information (ICA), and ultimately the military community (USA or NATO).
• ETRS89. As this system is defined precisely with regards to ITRS by EUREF, this should raise no problem if the issue is clearly documented