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IERS Message No. 311                                     August 30, 2016
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DGFI-TUM ITRS realization - DTRF2014


Dear colleagues,

We are happy to inform you about the publication of the final version of
the ITRS realization of DGFI-TUM called DTRF2014. The SINEX-files are
available via the PANGAEA data portal at
http://doi.pangaea.de/10.1594/PANGAEA.864046

The DTRF2014 is the first ITRS realization considering corrections for
non-tidal atmospheric and hydrological loading. Respective loading time
series for each station were provided by Tonie van Dam (GGFC). They are
provided together with the DTRF2014. The loading time series are based
on the atmosphere model NCEP and the hydological model GLDAS.

Please note: In contrast to the final DTRF2014, the preliminary solution
published by the end of 2015 was computed using a classical approach
without correcting for non-tidal loading.

The DTRF2014 is provided in four technique-specific SINEX files (i.e.
separate for GNSS, VLBI, SLR and DORIS) as well as in one common SINEX
file (all techniques). The zipped files on the PANGAEA server are named

- DTRF2014.snx.gz
- DTRF2014_GPS.snx.gz
- DTRF2014_VLBI.snx.gz
- DTRF2014_SLR.snx.gz
- DTRF2014_DORIS.snx.gz

They contain estimated station coordinates and velocities for the
reference epoch 2005.0 as well as the corresponding full
variance/co-variance matrix.

Consistently estimated EOP are available in the file
DTRF2014_EOP-F2.DAT.

In addition, in order to best approximate the quasi-instantaneous
station position at each epoch, we provide station-specific models for
the correction of the station positions computed from the linear model.
These station-specific models are:
- non-tidal loading time series for each station; stored in the archives
NT-ATML.zip and NT-CWSL.zip,
- residual time series resulting from an epoch-wise transformation of
the technique-specific solutions w.r.t. the combined DTRF2014 solution;
stored in the archive RESID.zip,
- time series of origin translations derived from a transformation of
the weekly SLR station network w.r.t. the combined DTRF2014 solution;
stored in the archive DTRF2014_SLRorigin.zip.

A manual for the application of these corrections is provided
(DTRF2014_readme.pdf).

Further information on the DTRF2014 can be found on the webpages of
DGFI-TUM:
http://www.dgfi.tum.de/science-data-products/dtrf2014/
http://www.dgfi.tum.de/DTRF2014_en

When using DTRF2014 data, please cite:
Seitz M., Blossfeld M., Angermann D., Schmid R., Gerstl M., Seitz F.:
The new DGFI-TUM realization of the ITRS: DTRF2014 (data).
Deutsches Geodaetisches Forschungsinstitut, Munich,
doi:10.1594/PANGAEA.864046, 2016.

If you have further questions on the DTRF2014 or about the computation
of quasi-instantaneous station coordinates, don't hesitate to contact
manuela.seitz[at]tum.de or mathis.blossfeld[at]tum.de.

With best regards,
on behalf of the DGFI-TUM ITRS CC team,
Manuela Seitz


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