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Author: Zuheir Altamimi <br>
<br>
Dear Colleagues,<br>
<br>
Please let me first wish you all a Happy New Year 2021, despite the terrible pandemic situation.<br>
<br>
This is a friendly reminder to the owners, operators and surveyors of ITRF Co-location sites,
<br>
soliciting them to submit their local survey results for inclusion in the ITRF2020 computation.<br>
Many thanks to colleagues who already submitted their local tie data, or promised to do so in the very near future.<br>
Please be reminded, as mentioned in the email appended below, if more than one local surveys were operated<br>
at your site, at different epochs, we kindly ask you to make all the results available: one SINEX per local survey results.<br>
Although the deadline for the IAG services (IDS, IGS, ILRS and IVS) to submit their contribution to ITRF2020 is February 10,
<br>
2021, for local survey data we would be happy to receive your contribution after the deadline, if more time is needed<br>
for you to process your local survey observations.<br>
<br>
Please don't hesitate to get in contact with the ITRF group ( itrf at ign.fr) if you have any questions or need assistance.<br>
<br>
Sincerely Yours<br>
Zuheir Altamimi<br>
Head, ITRS Center<br>
President, International Association of Geodesy <br>
<br>
<div class="moz-cite-prefix">On 04/05/2020 at 14:23, Zuheir Altamimi wrote :<br>
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Author: Zuheir Altamimi <br>
<br>
<div>Dear Colleagues, <br>
</div>
<div><br>
</div>
<div>This email is addressed to the owners, operators and surveyors of ITRF Co-location sites.<br>
<br>
I hope that you are all safe and healthy in this unprecedented and terrible pandemic situation.<br>
<br>
In building and operating Core co-location sites, your contribution is fundamental to
<br>
global geodesy and to the ITRF in particular.<br>
<br>
The four IAG services (IDS, IGS, ILRS and IVS) are currently reprocessing their data<br>
in preparation for their contribution to the ITRF2020. The ITRF2020 Call for Participation
<br>
is available here: <a class="moz-txt-link-freetext" href="http://itrf.ign.fr/doc_ITRF/CFP-ITRF2020.pdf">
http://itrf.ign.fr/doc_ITRF/CFP-ITRF2020.pdf</a><br>
<br>
Recent and past results of local surveys at ITRF co-location sites are solicited for inclusion<br>
in ITRF2020 analysis. Local ties should be provided in SINEX format, with full variance covariance<br>
information, together with a report if available.<br>
If more than one local surveys were operated, at different epochs, we kindly ask you to make all<br>
the results available: one SINEX per local survey results.<br>
In the scope of the activity of the IAG working group WG 1.2.1 Methodology for surveying geodetic<br>
instrument reference points (joint with IERS), co-location site survey and survey product metadata<br>
are being collected. When submitting your local tie SINEX file(s), we kindly ask you to fill in and
<br>
send the excel sheet/form available at the following link:<br>
<br>
<a class="moz-txt-link-freetext" href="http://itrf.ign.fr/local_surveys.php">http://itrf.ign.fr/local_surveys.php</a><br>
<br>
Please submit your files to:<br>
ITRS Center: <a class="moz-txt-link-abbreviated" href="mailto:itrf@ign.fr">itrf@ign.fr</a>
<br>
and <br>
IERS Central Bureau: <a class="moz-txt-link-abbreviated" href="mailto:central_bureau@iers.org">
central_bureau@iers.org</a><br>
<br>
The IERS ITRS Product Center is particularly grateful to all the institutions that provide the necessary investment for the space geodetic observatories which constitute the main ITRF foundation.<br>
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<div><br>
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<div>Counting on your valuable contributions.<br>
</div>
<div><br>
Sincerely Yours<br>
Zuheir Altamimi<br>
Head, ITRS Center<br>
President, International Association of Geodesy <br>
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