1. VieVS User Workshop 7 – 9 September, 2010 Vienna Introduction Johannes Böhm

2. VieVS User Workshop 20102 Occam Occam 6.1 LSM had some weaknesses equinox-based transformation between TRS and CRS only piecewise linear rates starting with the first observation old Fortran with COMMON blocks

3. VieVS User Workshop 20103 Occam Occam 6.1 LSM had some weaknesses no graphical interface no handbook developers separated by 10.000 km / 12 h...

4. First idea to use Matlab.. goes back to Thomas Hobiger in 2005 VieVS User Workshop 20104

5. Why Matlab? our students are experts in Matlab, but not in Fortran or C++ nor are we It is expensive, but there are non- commercial alternatives or we can provide executables VieVS User Workshop 20105

6. Why did we develop VieVS? to have VLBI software for students to get them involved with bachelor, diploma and ph.d. theses they can add their own tools to have a clear structure new modules can be added rather easily VieVS User Workshop 20106

7. Why did we develop VieVS? easy functional model with piecewise linear offsets at integer hours in the sense of GGOS non-rotating origin right from the beginning (no equinox-based transformation) VieVS User Workshop 20107

8. Why did we develop VieVS? VieVS User Workshop 20108

9. Policy Available for registered users easier to get feedback to be able to report bugs to the users We are open for co-operation new modules developed at other institutes (e.g. co-authorship in VieVS handbook) VieVS User Workshop 20109

10. Policy OPT and outlier files will not be generally made available these make the solutions different VieVS User Workshop 201010

11. Outlook VieVS User Workshop 201011

12. Data format New IVS WG4 data format to be implemented (netcdf) VieVS User Workshop 201012

13. Troposphere delays from external files ray-traced delays, VMF1, site pressure, NWM pressure,... only GMF/GPT internally VieVS User Workshop 201013

14. VieVS Face-lifting one interface VieVS User Workshop 201014

15. SINEX Results in SINEX format getting operational in Vienna VieVS User Workshop 201015

16. Close gap with raw observations determination of ambiguities (delay-rate) solution phase solution for VLBI2010? software correlator for short sessions??? VieVS User Workshop 201016

17. Kalman Filter and equivalent classical least-squares adjustment VieVS User Workshop 201017

18. System Test Octave and executables VieVS User Workshop 201018

19. Source structure Volunteers? VieVS User Workshop 201019

20. Documentation!! VieVS User Workshop 201020