<abstract xmlns="http://www.w3.org/1999/xhtml">The IAG (International Association of Geodesy) Sub-Commission for the European reference
frame (EUREF) passed a resolution recommending application of the ETRF2000 frame as
national realizations of the ETRS89 reference system during the XXth EUREF Symposium in
Gävle (Sweden) in 2010. The PL-ETRF2000 system is comprised of EPN (EUREF
Permanent Network) sites. Their coordinates and their temporal changes (velocities) were
accurately determined on the basis of long-term GNSS observations. The transfer of the PLETRF2000
system onto the territory of Poland is realized by the ASG-EUPOS (Active
Geodetic Network – European Position Determination System) permanent sites network. The
ASG-EUPOS tasks include also system maintenance by continuous or periodical control of
the coordinates and velocities constancy.
According to the current Regulation of the Ministry of Administration and Digitization
concerning geodesic, gravimetric and magnetic warps, the accuracy of sites of the
fundamental warp (EPN sites belonging to ASG-EUPOS) may not be worse than 0.01 m for
horizontal position and 0.02 m for geodesic height. It results in the necessity to monitor the
performance of the reference sites for proper maintenance of the reference system.
A new team for modeling deformations in Europe was established within the EUREF
Working Group (The EUREF Working Group on Deformation Models) during the EUREF
2012 Symposium in Paris. One of its tasks is taking geo-kinematic models into consideration
for national realizations of the ETRS89 and maximum usage of knowledge concerning the
velocity field.
The paper deals with the problem of temporal validity of the catalogue coordinates and
the necessity of periodical updating them on the basis of velocities derived from long-term
observations. Although Poland is located in a tectonically calm area and the intraplate
velocities are small, some of the EPN and ASG-EUPOS sites have significant velocities and
are subject to vertical movements. Lack of periodical updating of the coordinates realizing the
reference system will cause lack of fulfillment of the assumed accuracy criterion.
Analysis of horizontal and vertical velocities of sites belonging to the fundamental
warp lead to assumption that two sites will exceed horizontal criterion in a period of time
shorter than 10 years counting from the reference epoch (i.e. from 2011.0): KATO horizontal
coordinates should be updated in 2014 and GWWL in 2021. Mores sites will exceed vertical criterion: BOGI (2021), GWWL (2015), KATO (2019), SWKI (2019) and ZYWI (2021). The
vertical component updating will require of course changes of the horizontal component
(coordinates are determined in the Cartesian orthogonal XYZ coordinate system and then
recalculated for the ellipsoidal coordinates). Besides periodical coordinates updating it is
recommended to conduct repeated processing for the entire network according to the EUREF
standards for taking the current GNSS observations into consideration.</abstract>

The IAG (International Association of Geodesy) Sub-Commission for the European reference
frame (EUREF) passed a resolution recommending application of the ETRF2000 frame as
national realizations of the ETRS89 reference system during the XXth EUREF Symposium in
Gävle (Sweden) in 2010. The PL-ETRF2000 system is comprised of EPN (EUREF
Permanent Network) sites. Their coordinates and their temporal changes (velocities) were
accurately determined on the basis of long-term GNSS observations. The transfer of the PLETRF2000
system onto the territory of Poland is realized by the ASG-EUPOS (Active
Geodetic Network – European Position Determination System) permanent sites network. The
ASG-EUPOS tasks include also system maintenance by continuous or periodical control of
the coordinates and velocities constancy.
According to the current Regulation of the Ministry of Administration and Digitization
concerning geodesic, gravimetric and magnetic warps, the accuracy of sites of the
fundamental warp (EPN sites belonging to ASG-EUPOS) may not be worse than 0.01 m for
horizontal position and 0.02 m for geodesic height. It results in the necessity to monitor the
performance of the reference sites for proper maintenance of the reference system.
A new team for modeling deformations in Europe was established within the EUREF
Working Group (The EUREF Working Group on Deformation Models) during the EUREF
2012 Symposium in Paris. One of its tasks is taking geo-kinematic models into consideration
for national realizations of the ETRS89 and maximum usage of knowledge concerning the
velocity field.
The paper deals with the problem of temporal validity of the catalogue coordinates and
the necessity of periodical updating them on the basis of velocities derived from long-term
observations. Although Poland is located in a tectonically calm area and the intraplate
velocities are small, some of the EPN and ASG-EUPOS sites have significant velocities and
are subject to vertical movements. Lack of periodical updating of the coordinates realizing the
reference system will cause lack of fulfillment of the assumed accuracy criterion.
Analysis of horizontal and vertical velocities of sites belonging to the fundamental
warp lead to assumption that two sites will exceed horizontal criterion in a period of time
shorter than 10 years counting from the reference epoch (i.e. from 2011.0): KATO horizontal
coordinates should be updated in 2014 and GWWL in 2021. Mores sites will exceed vertical criterion: BOGI (2021), GWWL (2015), KATO (2019), SWKI (2019) and ZYWI (2021). The
vertical component updating will require of course changes of the horizontal component
(coordinates are determined in the Cartesian orthogonal XYZ coordinate system and then
recalculated for the ellipsoidal coordinates). Besides periodical coordinates updating it is
recommended to conduct repeated processing for the entire network according to the EUREF
standards for taking the current GNSS observations into consideration.

The problem of temporal validity of reference coordinates in the context of reliability of the ETRS89 system realization in Poland

Artificial Satellites

The IAG (International Association of Geodesy) Sub-Commission for the European reference
frame (EUREF) passed a resolution recommending application of the...

The problem of temporal validity of reference coordinates in the context of reliability of the ETRS89 system realization in Poland

Published Online: Dec 14, 2012

Page range: 177 - 188

DOI: https://doi.org/10.2478/v10018-012-0023-9

Keywords
ASG-EUPOS, ETRS89, ETRF, reference frame, coordinates’ stability

This content is open access.

The problem of temporal validity of reference coordinates in the context of reliability of the ETRS89 system realization in Poland

Published Online: Dec 14, 2012

Page range: 177 - 188

DOI: https://doi.org/10.2478/v10018-012-0023-9

KeywordsASG-EUPOS, ETRS89, ETRF, reference frame, coordinates’ stability

This content is open access.

Keywords
ASG-EUPOS, ETRS89, ETRF, reference frame, coordinates’ stability