OCCAM LSM for LINUX: Please mind that it is no longer maintained in Vienna!!

Reference for OCCAM: O. Titov, V. Tesmer, J. Boehm, OCCAM v. 6.0 software for VLBI data analysis, in International VLBI Service for Geodesy and Astrometry 2004 General Meeting Proceedings, edited by Nancy R. Vandenberg and Karen D. Baver, NASA/CP-2004-212255, 2004.

OCCAM_61 package (from Volker on March 8, 2007)

 Copy the whole OCCAM directory and the subdirectories. It should work with g77, ifort, or g95. In this version the interface for DOGS-CS is commented out because this only works with g95. Any changes to it which are made after March 8, 2007 will be documented.

NGS files

Please acknowledge the IVS, add 'VLBI' to the keywords, and use the reference: W. Schlueter, E. Himwich, A. Nothnagel, N. Vandenberg, A. Whitney, IVS and Its Important Role in the Maintenance of the Global Reference Systems, Advances in Space Research, Vol. 30, No. 2, pp. 145-150, July 2002.

Ephemerides and EOPs

 EOP 05 C04 values are used for the Earth Orientation Parameters. The yearly files have to be copied to the EPHEM directory. It is the same format as povided at the IERS page, only the header is removed.
Reference for ephemerides: Standish, E. M., The Observational Basis for JPL’s DE200, the Planetary Ephemerides of the Astronomical Almanac, Astron. Astrophys., 233, pp. 252–271, 1990.

Parameterization

 You need to have a file 'lsm_opt.in' in your WORK directory.

Vienna Mapping Functions 1

 These yearly files (e.g. y2007.vmf1_r) have to be copied to the VM1_ALL directory.
Reference: Boehm, J., B. Werl, and H. Schuh, Troposphere mapping functions for GPS and very long baseline interferometry from European Centre for Medium-Range Weather Forecasts operational analysis data, J. Geophys. Res., 111, B02406, doi:10.1029/2005JB003629, 2006.

Isobaric Mapping Functions

The coefficients for the hydrostatic Isobaric Mapping Functions which are determined on a global grid can be found at the VMF1-webpage. After 2006.0 they need to be converted to time series for the individual station!
Reference: Niell, A.E., Improved atmospheric mapping functions for VLBI and GPS, Earth Planets Space, 52, pp. 699-702, 2000.

Linear Horizontal Gradients

 These yearly files (e.g. y2007.lhg_r) have to be copied to the GRA_ALL directory.
Reference: J. Boehm, and H. Schuh, Troposphere gradients from the ECMWF in VLBI analysis, Journal of Geodesy , doi:10.1007/s00190-007-0144-2, 2007.

Atmosphere Loading Coefficients

 There is the choice to apply only S1/S2 tidal loading, only the non-tidal part, or both. For the tidal part a file S12_ATM.DEF has to be available in the WORK directory. A realization for it by Tonie van Dam can be found here. Leonids values are here.

Non-tidal: Reference: L. Petrov, J.-P. Boy, Study of the atmospheric pressure loading signal in VLBI observations, J. Geophys. Res., vol. 109, No. B03405, 10.1029/2003JB002500, 2004.

Terrestrial and Celestial Reference Frame

Vienna Terrestrial/Celestial Reference Frame IGG05R01.CAT
Reference: R. Heinkelmann, J. Boehm, H. Schuh, V. Tesmer, Global VLBI solution IGG05R01, IVS 2006 General Meeting Proceedings, edited by D. Behrend and K. D. Baver, NASA/CP-2006-x, 2006.

DGFI Terrestrial/Celestial Reference Frame 06R01__1.CAT.

IRTF2000 plus ICRF-Ext1 called 2000EXT1.CAT

VLBI Terrestrial Reference Frame VTRF2005 and ICRF-Ext1 called VTRF2005.CAT

Vienna Terrestrial/Celestial Reference Frame IGG07R04.CAT
(NNR/NNT wrt ITRF2005)

Thermal deformation

 Reference: J. Wresnik, R. Haas, J. Boehm, H. Schuh, Thermal deformation of VLBI antennas, in: Proceedings of the 17th Working Meeting on European VLBI for Geodesy and Astrometry, edited by M. Vennebusch and A. Nothnagel, April 22-23 2005, 2005.

A version for the file THERMAL.DEF which is based on GPT can be found here.

Ocean Loading coefficients

The ocean loading files have to be copied to the WORK directory and renamed to LOADING.OCE. Reference for ocean loading: Scherneck, H.-G., A parametrized solid earth tide model and ocean tide loading effects for global geodetic baseline measurements, Geophys. J. Int., 106, 677-694, 1991.

LOADING.GT2 is based on the ocean tide model GOT00.2, and it is provided by H.G. Scherneck. Reference for this ocean tidel model: Ray, R., A Global Ocean Tide Model From TOPEX/Poseidon Altimetry/GOT99.2 - NASA/TM-1999-209478, pp. 58, Goddard Space Flight Center/NASA, Greenbelt, MD, 1999.

LOADING.FES is based on the ocean tide model FES2004

OCCAM User Guide

A description of OCCAM 6.1 LSM is provided.
Robert Heinkelmann prepared a presentation about OCCAM.
Back to the main pape of IGG

This page was prepared by Johannes Boehm
Last update: 14-January-2008