- Regional Reference Frame Sub-Commission for Europe
Infobox Union
name= EUREF
country=
affiliation= International Association of Geodesy
members= more than 30 countries
full_name= Regional Reference Frame Sub-Commission for Europe
native_name=
founded=1987
current=
head=
dissolved_date=
dissolved_state=
merged_into=
office=Brussels ,Belgium
people= Carine Bruyninx, Chair of the Technical Working Group
website= [http://www.euref.eu/ www.euref.eu]
footnotes=Regional
Reference Frame Sub-Commission forEurope (EUREF) is the sub-commission of the International Association of Geodesy (IAG), part of the Sub-Commission 1.3 ("RegionalReference Frame s"), under IAG Commission 1 ("Reference Frame s").EUREF deals with the definition, realization and maintenance of the European Geodetic Reference Frame. The goal of EUREF is to establish a unified geodetic datum (ETRS89) and a consistent network of reference stations (EPN) throughoutEurope . EUREF was founded in1987 at theIUGG General Assembly held inVancouver .Mission
EUREF is driven by a voluntary agreement of scientific organisations and national geodetic/geographic agencies of the member countries, who are willing to replace their legacy national geodetic datums with a unified European
Reference Frame and join their national networks of reference stations into a common European network. The mandate of EUREF is to foster and coordinate the activities of the member countries, which are financed and managed on the national level. EUREF realizes and maintains ETRS89, the Europeangeodetic datum , which is to become a single datum used for geodetic applications in all the member countries. A key instrument in maintaining ETRS89 is the EUREF Permanent Network (EPN), a network of reference stations which covers theEuropean continent . EUREF is also working on the European Vertical Reference System (EVRS), which goal is to determine a unified dm-level accurategeoid model and gravity-referenced height system throughoutEurope . EUREF coordinates its activities with EuroGeographics.tructure
The activities of EUREF are discussed and decisions are taken at the annual
symposium . The last symposia have been attended by more than 120 participants coming from about 30 member countries ofEurope . The results of EUREF are available in the symposiaproceedings , which contain the presented scientific papers as well as national reports, resolutions and documentation. Current ctivities are governed by the "Technical Working Group (TWG)", which is elected at the symposia and is meeting two/three times a year to manage current activities. The minutes of the TWG meetings are published annually together with the symposia proceedings.
=European Terrestrial Reference System 1989 (ETRS89)=ETRS89 is a Cartesian
ECEF geodetic datum , in whichEurasian Plate as a whole is static. WithinEurope ,coordinate s andmap s based on ETRS89 are stable because temporal variations due to thecontinental drift are minimized. ETRS89 coincided with the global ITRS datum in1989 , hence the name. ETRS89 and ITRS diverge due to thecontinental drift at a speed about 2.5 cm per year.European Vertical Reference System (EVRS)
EVRS is a zero-tidal gravity-related height reference system. The EVRS is realized by the geopotential numbers and normal heights of nodal points of the United European Levelling Network 95/98 (UELN 95/98) extended for Estonia, Latvia, Lithuania and Romania in relation to the
Normaal Amsterdams Peil (NAP). The geopotential numbers and normal heights of the nodal points are available for the participating countries under the name UELN 95/98 which is now given the name EVRF2000.Projects
There are several projects under development at EUREF.
*"EUREF Permanent Network (EPN)" is the main project of EUREF and a backbone in the maintenance of the .
*"European Combined Geodetic Network (ECGN)" is a research project aimed at high accuracy geoid determination.
*"EUVN Densification Action" studies discrepancies between EUVN (European United Vertical Network) and the gravimetric geoid.
*"Unified European Levelling Network (UELN)" manages the development of the European levelling network.
*"ETRS89 velocity field model" studies residual local movements of theEurasian Plate relative to ETRS89.External Links
* [http://www.euref.eu/ EUREF home page]
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