The VieVS software has been written by the Research Group Advanced Geodesy at the Department of Geodesy and Geoinformation (GEO), Vienna University of Technology. It includes state of the art models that coincide with the latest International Earth Rotation Service (IERS) conventions. It is written in Matlab (version 8.4-R2014b or later is required) which has the advantages of being easy to use and source code changes can be applied without much effort. Unfortunately Matlab is expensive and is not as fast as C++ or FORTRAN. Matlab is, however, widely used, hence many research facilities are already in possession of a licence. The slower speed is not a big disadvantage since today's computer hardware is fast enough for normal usage of the software.
The VieVS software is structured in different parts:
Apart from the main structure in VieVS there are three other modules, namely VIE_SCHED, VIE_SIM and VIE_GLOB.
Parameters and models can be easily selected using the graphical user interface (GUI) of VieVS. The output is written to the command window of Matlab or, for some modules, in log files. The results are saved as Matlab files or text files.