Subject: [DORISMail] No 0357 : new DORIS IGN/JPL products available at CDDIS - stcd files Dear colleagues, The IGN/JPL Analysis Center is now generating stcd files for all DORIS stations. These stcd files basically contain differences of coordinates (in X, Y, and Z and in latitude, longitude and altitude) with the proper estimated standard deviations. These files are directly derived from the more recent ignwd05 solutions (expressed in ITRF2000). Only a reference position (provided in the header of the stcd file) has been removed. No velocity correction has been applied. Those files are then properly suited for scientists doing geophysical studies on a specific DORIS station or on a group of stations, looking for discontinuities in the time series or estimating velocities directly expressed in ITRF2000 reference frame. Direct comparison with other techniques such as GPS should also be easier to perform. These files can be obtained (eg. for station yelb) at CDDIS in the following directory: ftp://cddisa.gsfc.nasa.gov/pub/doris/products/stcd/ign03wd01/ign03wd01.stcd.yelb.Z They presently contain results since 1993.0 and up to the latest release of the ENVISAT/DORIS data (September 21, 2004). These stcd files will be regularly updated at CDDIS every time a new weekly IGN/JPL sinex solution is submitted to CDDIS, so on average once a week. Please feel free to contact me if you have any questions or concerns about the content of those new stcd files or on the procedure used to derive positions in ITRF2000. It is my understanding that the IDS Central Bureau will later use those files to generate plots available in GIF format at the same place at CDDIS as well as on the IDS web site in the future. There is a description of all JPL/IGN IDS products in file, explaining differences with previous and obsolete submissions: ftp://cddisa.gsfc.nasa.gov/pub/doris/products/sinex_series/ign.snx.readme Best regards Pascal PS: If you plan to use those stcd files for your scientific investigations, proper reference to this work would be appreciated. -- Pascal Willis Jet Propulsion Laboratory, MS 238-646 Ph : 1-818-393-4748 4800 Oak Grove Drive FAX: 1-818-393-4965 Pasadena CA 91109 Em : Pascal.R.Willis@jpl.nasa.gov