****************************************************************************** dorismail 12-Apr-2007 09:33:21 Message No 0490 ****************************************************************************** Author: Pascal Willis Subject: providing station velocity precision in IGN/JPL plots Dear colleagues, just for your information, following some specific request from users, the IGN/JPL station coordinates time series plots now all include the estimated precision for the station velocity determination (for the free components). See some examples at the following page (regularly updated every week): http://ids.cls.fr/html/doris/ids-station-series.php3 This estimated precision uses the formal error provided for each weekly solution and also re-weight this a posteriori precision using the observed Chi2/DOF. So it not just a velocity formal error, but it also takes into account the observed weekly precision for station coordinates and the consistency of the time series with a linear model. In our opinion, this quantity can now be used directly by groups interested in global plate tectonics or in the velocity of a specific station for more local or regional geophysical studies. Please feel free to recontact me at willis@ipgp.jussieu.fr if you detect some problems, if you see some interest or if you would like to see some new types of information Best regards Pascal PS: We also plan to make these time series available in ITRF2005 within the next few months, when all necessary tests are conclusive. For consistency, we would then submit 3 solutions every week instead of the current 2: 1 in free-network, 1 in ITRF2000 and 1 in ITRF2005 (all since 1993.0) -- ------------------------------------------------------------------------------ Pascal Willis Institut de Physique du Globe de Paris Ph : +33-(0)1-44-27-24-84 Etudes Spatiales et Planetologie FAX: +33-(0)1-44-27-73-40 4, place Jussieu, Case 89 Em : willis@ipgp.jussieu.fr Paris 75252 Cedex 5, France http://www.ipgp.jussieu.fr/~willis/ ------------------------------------------------------------------------------ Cliquez sur l'url suivante https://www.mailcontrol.com/sr/VxgBVX+nvqHHAHIRBQjbPZEI4Gw92jgO7sNF!KlVW59wNqYK6IoFe!oYDo+QMHxfcs3VUFJzXjLHY0GF!gWYJ0jkrBeAT8GhN73nQiZXmQ054o7q5sIIKmKjXSBSJ7n+DBAk4Le6TUf!yMv6kDKnsBw6h6iL6zpzXk6YfX05ndJh7Srz0+kag8OURl0z9aPvOCthcgH78Jngqn46se16Q5RS1djMmiDe si ce message est indésirable (pourriel). Please do not reply directly to this message, but send comments and suggestions to IDS.central.bureau@cls.fr