THE
11TH SYMPOSIUM OF THE EUREF SUBCOMMISSION
The 11th symposium of the EUREF Subcommission was held
in Dubrovnik from 16. - 19.5.2001. Proceedings will be published in AMitteilungen des
Bundesamtes für Kartographie und Geodäsie@.
On this symposium the following resolutions were
adopted:
Resolution No. 1
The IAG Subcommission for Europe (EUREF)
recognising that
-in
May/June 1994 the EUREF-SLOCRO-94 campaign in Slovenia and Croatia was
observed,
-in
September/October 1995 the Slovenia-95 and CROREF-95 campaigns in
Slovenia and Croatia were observed,
-in
August/September 1996 the CROREF-96 campaign in Croatia was observed,
and
all the results were submitted to the EUREF Technical Working Group
as a combined EUREF-CRO-94/95/96 solution,
where it was accepted as class B standard (about 1 cm at the epoch of
observations)
endorses
the
subsets of points for Croatia submitted to the EUREF Technical Working
Group as improvements and extensions of EUREF89,
but considering
that two points in Croatia observed during the EUREF-CROSLO-94
campaign were destroyed,
recommends
that all old Croatian points should be deleted from the EUREF database
and replaced by the subset of points selected from the
EUREF-CRO-94/95/96 solution.
Resolution
No. 2
The IAG Subcommission for Europe (EUREF)
considering
-the availability of the ITRF2000 as an improved and accurate
realisation of the ITRS,
-the
improved determination of the rotation of the Eurasian plate using
ITRF2000 site velocities,
recommends
to replace the NNR-NUVEL-1A rotation rate values by the ones derived
from ITRF2000 in the
transformation formula linking ETRS89 to ITRS.
Resolution
No. 3
The IAG Subcommission for Europe (EUREF)
recognising the
significant practical and scientific value of the EVRS
noting the usefulness of improving its realisation
EVRF2000
asks national levelling data providers to UELN/EUVN
to inform the Technical Working Group on the tidal system and other
corrections used,
recommends
that in the future levelling data be submitted in the zero tidal
system according to the EVRS definition and corresponding IAG
resolution 16, 1983.
Resolution No. 4
The IAG Subcommission for Europe (EUREF)
recognising
-the
European Vertical GPS Reference Network (EUVN) with its GPS-derived
ellipsoidal heights and levelled connections to UELN,
-the
definition of the European Vertical Reference System EVRS with its
first realisation UELN 95/98, called EVRF2000,
considering
-this
implicit pointwise realisation of a European geoid consistent with
both ETRS89 and EVRS,
-the
existence of a large number of regional and local geoids in Europe,
-the
urgent need by the navigation community for a height reference
surface,
asks
its Technical Working Group and the European Subcommission of the
IAG IGGC (International Gravity and Geoid Commission) to take all
necessary steps to generate a European geoid model of decimetre
accuracy consistent with ETRS89 and EVRS.
Resolution No. 5
The IAG Subcommission for Europe (EUREF), which held
its eleventh EUREF symposium in Dubrovnik from May 16-18, 2001,
expresses its heartfelt thanks to the Local Organising Committee, its
chairman Zeljko Bacic and
the State Geodetic Administration, as well as the Cadastre Office in
Dubrovnik and the International Centre of Croatian Universities, for
organising the symposium and for the excellent arrangements resulting
in a very successful meeting.
Joao Agria Torres, Lisbon: jatorres@ipcc.pt
Helmut Hornik, Munich: hornik@dgfi.badw.de
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