General Information Members Meetings & Documents Working Groups
Updated 2016.01.13

Technical Working Group (TWG) - Working Groups

Working Group on "EPN Densificatio"

The Working Group on  “EPN Densification” was introduced in 2015; it is chaired by Ambrus Kenyeres.

The goal of this WG is homogenize and strengthen the efforts towards a densification of the EPN with national and sub-regional contributions which have been undertaken by the Reference Frame Coordinator since several years

For more information read the Charter of the Working Group.


Working Group on "Deformation Models"

The Working Group on “Deformation Models” was introduced 2012; it is chaired by Martin Lidberg. The goal of this WG is - relying on the known 3D crustal velocities of GNSS reference stations with sufficient detail and accuracy - to obtain velocity models and to significantly improve the prediction of the time evolution of coordinates and overcome the limitations in the use of the ETRS89. A general understanding of the physics behind such a velocity field (PGR, interplate and intraplate deformation, atmospheric effects, etc.) is also part of this WG.

For more information read the Charter of the Working Group

Web-page of the working group


Multi-GNSS Working Group

The “Multi-GNSS Working Group”was encouraged at the EUREF symposium in Gävle (2010); it consists of 8 EUREF TWG members and is chaired by Elmar Brockmann. The establishment of this WG should stimulate further institutions to participate and to actively work towards the enhancement of the current EPN infrastructure and EPN products towards Multi-GNSS.

For more information read the Proposal of action items of the Working Group (status Nov. 2012).


Working Group on "EPN Reprocessing"

The Working Group on “EPN Reprocessing” was introduced 2009; it is chaired by Christof Voelksen. During the past years it has been realized that the analysis of the global as well as the regional GNSS networks are affected by different factors like the reference system realization, correction models, analysis strategies and software packages. Therefore products provided by the IGS or the individual analysis centers in the form of precise orbits, ERPs or clocks are dependent on these different factors that were available at the time of generating these products. As a consequence the coordinates estimated by the EPN Local Analysis Centers (LAC) over the past decade are not consistent over the entire period of time. Inconsistencies in the time series of the coordinate appear most frequently whenever models (e.g. antenna PCV) or the reference frame realization were changed.

For more information read the Charter of the Working Group.


Working Group on "Future Development of ETRS89"

The Working Group on “Future Development of ETRS89” was established 2009. The TWG decided to create a Working Group (WG) dedicated to the ETRS89 future development, realisation and its target users. Another important aspect that this WG should deal with is to clarify its adequateness with its parent system, the (ITRS) for all geoscience’s applications, satellite navigation systems and geo-information communities. In effect the IAG is initiating a process for a formal international recognition of the ITRS and EUREF is promoting the adoption of the ETRS89 within INSPIRE directive. Therefore a clear understanding and clarification is needed, emphasizing that the ETRS89 is linked to the ITRS by a pure mathematical formula.

Chaired by Martin Lidberg it was closed 2011 after successfully reaching its goals.

For more information read the Charter of the Working Group.