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IERS Message No. 402                                        May 04, 2020
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ITRF2020: Call for local survey results


Dear Colleagues,

This email is addressed to the owners, operators and surveyors of ITRF
Co-location sites.

I hope that you are all safe and healthy in this unprecedented and
terrible pandemic situation.

In building and operating Core co-location sites, your contribution is
fundamental to global geodesy and to the ITRF in particular.

The four IAG services (IDS, IGS, ILRS and IVS) are currently
reprocessing their data in preparation for their contribution to the
ITRF2020. The ITRF2020 Call for Participation is available here:
http://itrf.ign.fr/doc_ITRF/CFP-ITRF2020.pdf

Recent and past results of local surveys at ITRF co-location sites are
solicited for inclusion in ITRF2020 analysis. Local ties should be
provided in SINEX format, with full variance covariance information,
together with a report if available.

If more than one local surveys were operated, at different epochs, we
kindly ask you to make all the results available: one SINEX per local
survey results.

In the scope of the activity of the IAG working group WG 1.2.1
Methodology for surveying geodetic instrument reference points (joint
with IERS), co-location site survey and survey product metadata are
being collected. When submitting your local tie SINEX file(s), we kindly
ask you to fill in and send the excel sheet/form available at the
following link:

http://itrf.ign.fr/local_surveys.php

Please submit your files to:
ITRS Center: itrf@ign.fr
and
IERS Central Bureau: central_bureau@iers.org

The IERS ITRS Center is particularly grateful to all the institutions
that provide the necessary investment for the space geodetic
observatories which constitute the main ITRF foundation.

Counting on your valuable contributions.

Sincerely Yours
Zuheir Altamimi
Head, ITRS Center
President, International Association of Geodesy


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