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Titel |
Definition, Realization and Future Development of the European Terrestrial Reference System (ETRS89) |
VerfasserIn |
Z. Altamimi |
Konferenz |
EGU General Assembly 2009
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Medientyp |
Artikel
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Sprache |
Englisch
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Digitales Dokument |
PDF |
Erschienen |
In: GRA - Volume 11 (2009) |
Datensatznummer |
250026031
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Zusammenfassung |
The European Terrestrial Reference System 1989 (ETRS89) was defined
and adopted by EUREF in 1990 and since then is largely used by most of
European countries as the basis of their national geodetic systems.
The ETRS89 definition specifies two main conditions which are:
(1) the ETRS89 should coincidence with International Terrestrial Reference
System (ITRS) at epoch 1989.0 and (2) the ETRS89 is co-moving with the
stable part of the Eurasian tectonic plate. From that definition rigorous
mathematical transformation formula are deduced, allowing to derive from
each ITRFyy frame a corresponding ETRFyy frame, having a specific origin,
scale and orientation. This paper re-discusses the ETRS89 definition,
its mathematical link to the ITRS, focuses on the main ways allowing
its realization and raises the awareness of possible misinterpretation of
its definition and in particular the misuse of the epoch 1989.0 inherent
in its definition. Some numerical examples are provided in order to
illustrate the discussion. Particular focus is given to the ETRF2005 and
its consequences in terms of frame shifts (origin, scale and orientation)
as well as consequent station coordinate changes with respect to ETRF2000.
Nonetheless, a mathematically sound alternative of the ETRS89 realization
is also proposed, leading to frame definition changes due to the well
known estimation process, while perfectly satisfying the ETRS89 definition.
Given the fact that the ETRS89 is designed primarily for practical geo-
referencing applications where these frame shifts are not desired, it is
therefore recommended to adopt, conventionally, the ETRF2000 as the basic
frame of the ETRS89 realization for future adoption by the European
National Mapping Agencies. Procedure on how to access the ETRF2000 frame
from any ITRF version is described. |
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