On 20 May 2010 20:44, Jean-Guilhem Cailton <j...@arkemie.com> wrote: > Compared with the monitoring sites with other purposes (nice aircraft > noise tracking site by the way), I thought that at least for the
It tracks aircraft too :) > positioning systems monitoring sites, precise lat/lon should be available. They also still use imperial notation for lat/lon (DDMMSS.SSSS) even if they are using fractions of seconds, instead of decimal degrees... Although the datum is the most annoying, especially when they're monitoring WGS84 signals! > Looking at the Toulouse log file (and Bucarest's as well), it seemed to > use ITRF reference system (International Terrestrial Reference Frame - > http://itrf.ensg.ign.fr/), apparently fairly close to WGS84 for OSM > purposes (ftp://itrf.ensg.ign.fr/pub/itrf/WGS84.TXT). Most should be within a few metres of the WGS84 position, although over time and plates slipping things will drift. I wonder if new regional datums will be published to move things back closer to WGS84? _______________________________________________ Tagging mailing list Tagging@openstreetmap.org http://lists.openstreetmap.org/listinfo/tagging
