GNSS Service (IGS), formerly the International GPS Service, is a
voluntary federation of more than 200 worldwide agencies that pool
resources and permanent GPS & GLONASS station data to generate
precise GPS & GLONASS products.
The IAG Working Group on 'Regional Dense Velocity Fields' is part of IAG Sub-Commission 1.3 'Regional Reference Frames' which is embedded in IAG Commission 1 on Reference Frames.In a collaborative effort with the regional sub-commissions within IAG sub-commission 1.3 (such as EUREF), the IAG Working Group on 'Regional Dense Velocity Fields' aims at creating a dense global velocity field. For that purpose, EUREF collects GNSS-based velocity solutions from all over Europe and combines them into one single solution which is submitted to the Working Group. The Working Group then combines all regional and global velocity solutions to obtain a global dense velocity field.
ICG (International Committee on Global Navigation Satellite Systems)
The International Committee on Global Navigation Satellite Systems (ICG) had been established on a voluntary basis as an informal body to promote cooperation on matters of interest related to civil satellite-based positioning, navigation, timing and value-added services, as well as the compatibility and interoperability of global navigation satellite systems, while increasing their use to support sustainable development, particularly in developing countries. Members of ICG are providers of Global Navigation Satellite Systems (GNSS). EUREF is associated member of ICG. Goals of the annual meetings are reviewing and discussing developments in GNSS and to allow ICG members, associate members and observers to consider matters of interest. ICG also addressed GNSS technology in the era of multi-systems receivers and the impact of GNSS interoperability on timing and other user applications. Representatives from industry, academia and Governments shared views on GNSS compatibility and interoperability.
FIG was founded in 1878 in Paris and was known as the Fèdèration Internationale des Gèometres. This has become anglicized to the International Federation of Surveyors. It is an UN-recognized non-government organization (NGO), representing more than 100 countries throughout the world, and its aim is to ensure that the disciplines of surveying and all who practise them meet the needs of the markets and communities that they serve.
FIG is the premier international organization representing the interests of surveyors worldwide. It is a federation of the national member associations and covers the whole rage of professional fields within the global surveying community. It provides an international forum for discussion and development aiming to promote professional practice and standards.
Ten commissions lead FIG’s technical work. Each member association appoints a delegate to each of the commissions. Detailed information on the work of the commissions, their work plans, working groups, seminars, newsletters and publications can be found in the FIG webpage.
FIG Commission 5 (Positioning and Measurement) has the strongest links with IAG. A MoU between FIG and IAG was signed in 2001 and Commission 5 has the lead within FIG on the collaboration with IAG.
FIG Commission 5 deals with the science of measurement (instrumentation, methodology and guidelines) and the acquisition of accurate and reliable survey data related to the position, size and shape of natural and artificial features of the earth and its environment and including variation with time. The work plan of the commission covers the development, use and integration of technologies for positioning and measurement and the associated standardisation, best practice and fundamental reference frame issues. Many of the issues are global in nature and Commission 5, working with like-minded Sister Associations as IAG, is well placed to deal with them. FIG Council has also asked the Commissions to cooperate with United Nations Agencies to address global problems such as sustainable development and humanitarian needs. The disciplines covered by Commission 5 are at the heart of delivering solutions for the spatial aspects of these important global problems. Specific activities aimed at developing countries include examination of Low Cost Surveying Technologies, assistance with implementation of modern Geodetic Reference Frames and associated infrastructure and contribution to appropriate Continuing Professional Development programs.
FIG Commission 5 has during the last 10 years focused on facilitating the exchanging of information and knowledge regarding national GNSS CORS and the services connected to them, GNSS modernisation, new positioning and measurement techniques, as well as the development of regional reference frames. FIG has assisted and supported the work run by IAG on projects such as AFREF and more recently APREF.
WEGENER (Working Group of European Geoscientists for the Establishment of Networks for Earth science Research) is a IAG Inter commission project with Commission 1 and Commission 3. Commission 1 is responsible for regional and global reference frames, for the coordination of space techniques and for satellite dynamics. WEGENER contributes significantly to each one of these areas and, in particular, to regional and global reference frames by making available, in its study area, quality-tested regional data sets acquired with different space and terrestrial techniques, as well as relevant quality-tested solutions. Commission 3 is responsible for earth rotation and geodynamics. WEGENER provides its main contribution in the field of geodynamics by studying, regionally, both short and long-term crustal motions.