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IERS Message No. 225                                      March 27, 2013
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ITRF2013 Call for Participation


Dear Colleagues,

Please be informed that the ITRF2013 Call for Participation is now
released and could be retrieved at the ITRF web site, using the
following link:

http://itrf.ign.fr/ITRF_solutions/2013/CFP-ITRF2013-27-03-2013.pdf

In addition to the solicited global solutions from the four space
geodesy techniques (to be provided by the Technique Services), we also
solicit and encourage the owners of co-location sites to consider
conducting new local tie surveys using the most up to date survey
methods. Indeed, the local ties available at the ITRS Center for a
certain number of co-location sites are now old by 10 to 20 years. In
this respect, we would greatly appreciate the contribution of the
national mapping and space agencies investing and operating co-location
sites, which constitute the main foundation of the ITRF. More details
regarding the local tie survey are available in the ITRF2013 CfP.

Cordially
Zuheir Altamimi


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