Dear Axel, Axel Nothnagel wrote : > Zuheir, > What you write is certainly correct but I still think that known offsets > should be used rather than estimated. > It is hard to agree on an "exact" offset after an earthquake for instance. > I still don't understand how to proceed with the SINEX/DISCONTINUITY block. > Should we include this block containing infos about all stations with > discontinuities in every single of the 3500+ SINEX files even if a station > has not participated in the respective session? Or sould this block be kept > in a separate file and stored somewhere for general access? > Where will the known displacements be made available to the public? > The complete SINEX/DISCONTINUITY block should be kept in a separate file and stored at each TC server for general access. Just as the one generated by Jim, now. In a given single/session IVS SINEX file, stations having discontinuities should have their corresponding SOLN number and epochs in the following blocks: +SOLUTION/EPOCHS +SOLUTION/ESTIMATE Example for Denali earthquake: +SOLUTION/EPOCHS 7225 A 1 R 01:030:64913 01:031:64842 01:031:21778 7225 A 2 R 04:022:66713 04:023:66346 04:023:24758 +SOLUTION/ESTIMATE 7 STAX 7225 A 1 01:031:21778 m 2 -2.2815473.... 8 STAY 7225 A 1 01:031:21778 m 2 -1.4536450.... 9 STAZ 7225 A 1 01:031:21778 m 2 5.7569931.... 7 STAX 7225 A 2 04:023:24758 m 2 -2.2815474.... 8 STAY 7225 A 2 04:023:24758 m 2 -1.4536451.... 9 STAZ 7225 A 2 04:023:24758 m 2 5.7569930.... > > TSUKUB32, DSS65, Medicina and Eflsberg have undergone track repairs (which > other fixed station do you refer to?). If you deem appropriate please issue > new DOMES numbers for these sites. We will then use them in the future. > I would be willing to issue new DOMES numbers for these cases, but I need to know from the IVS all the related epochs, and helpfully the eccentricities. If I take the Epochs for these stations from the DISCONTINUITY file, generated now by Jim, then the lines with "SOLN 2" should be removed from this file. Moreover, you should not make use of the ECC values which refer to the old location of the antenna reference point. > Regards, Axel -- ---------------------------------------------------------------------- Zuheir Altamimi Email : altamimi@ensg.ign.fr Institut Geographique National Phone : 33 1 64 15 32 55 ENSG/LAREG FAX : 33 1 64 15 32 53 6-8 Avenue Blaise Pascal 77455 Champs-sur-Marne, FRANCE ----------------------------------------------------------------------