[Orekit Users] Fwd: IERS Message No. 353: Anticipated change to the IERS Bulletin A solution

[Luc Maisonobe <Luc.Maisonobe@c-s.fr>]

Hi all,

Here is a message from IERS specifying that Bulletin A will
switch soon to ITRF2014.

Orekit already supports IERS 2014 and when you build an ITRF frame
using FramesFactory.getITRF(IERSConvention, flag), you basically get
the ITRF that corresponds to the EOP you load. This means that up
to now, if you used BulletinA, you got ITRF 2008 and now you will
get ITRF 2014. The conversion from ITRF 2008 to ITRF 2014 was also
available using:

HelmertTransformation.Predefined.ITRF_2014_TO_ITRF_2008.
   createTransformedITRF(itrf2008, "ITRF-2008");

If you were using EOP 14 C04 files to retrieve EOP, you were already
using an ITRF 2014.

In any case, this is only important if you need a very high accuracy.

best regards,
Luc

-------- Message transféré --------
Sujet : IERS Message No. 353: Anticipated change to the IERS Bulletin A
solution
Date : Wed, 28 Mar 2018 18:32:27 +0200 (CEST)
De : central_bureau@iers.org
Pour : messages@iers.org

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IERS Message No. 353                                      March 28, 2018
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Anticipated change to the IERS Bulletin A solution


Dear IERS users,

As of Bulletin A Vol XXXI, No. 013, on 29 March, 2018, the IERS Rapid
Service/Prediction Center will transition the EOP solution to be
consistent with the 14 C04 for polar motion, UT1-UTC, and celestial pole
offsets. This change will result in a jump of less than 0.1 mas in polar
motion and 10 us in UT1-UTC. Small adjustments will be made to the
celestial pole offsets from approximately March 2017 to present in order
to be more consistent with the 14 C04 solution. The only users who need
to be concerned with this change are those who need EOP accuracy to be
better than 0.1 mas (~0.3 cm at the Earth's surface, ~1.2 cm at GPS
orbit.)

A final notice of the anticipated change will be contained near the top
of the IERS Bulletin A Vol XXXI, No. 013, on 29 March 2018, where notes
to users are placed. Users are strongly encouraged to review this
message to confirm the change or to note if the change was not
implemented due to technical problems.

Kind regards,
Nick Stamatakos
IERS Rapid Service Prediction Centre:
Production director and lead project scientist


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