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ITRS Combination Center at DGFI-TUM Deutsches Geodätisches Forschungsinstitut (DGFI-TUM)
Technische Universität München
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DTRF2020 release

The DTRF2020 release is available from Zenodo https://doi.org/10.5281/zenodo.8220523. It comprises:

Data set Description
SINEX file per technique The SINEX files contain the DTRF2020 station coordinates of the individual technique as well as the related full variance-covariance matrix
EOP file EOP file in IERS 20 C04 format. It contains the full set of EOP estimated consistently to DTRF2020.
SLR translation time series SLR translation time series [X,Y,Z] of SLR fortnightly/weekly solutions w.r.t. DTRF2020
Station position residual time series Station position residual time series per station and component [North,East,Up] w.r.t. DTRF2020. The temporal resolution of the time series depends on the temporal resolution of individual technique input data series (VLBI: session-wise, GNSS: daily, DORIS/SLR(1993.0-2021.0) weekly, SLR (1984-1993.0) fortnightly).
Non-tidal loading (NTL) time series (series provided by GGFC as used in DTRF2020)

NTL time series referring to the center of mass (CM) of the Earth per station and component [X,Y,Z] and [North,East,Up]. For their application in DTRF2020 computation, the time series are tailored to the observation time span of the individual stations and detrended. The reduced offsets and trends are provided as well (see below). The NTL series provided cover the time span from the beginning of observations of the individual technique until January 1 2023. They are reduced by the offsets and drifts obtained for the tailored series.

For applications referring to the center of figure (CF): we provide in addition NTL series referring to the CF. The series are tailored to the observation time span and detrended. The reduced offsets and trends are provided as well (see below). The CF-referred series are not applied in DTRF2020 computation. The NTL series provided cover the time span from the beginning of observations of the individual technique until January 1 2023. They are reduced by the offsets and drifts obtained for the tailored series.
Offsets and trends reduced from NTL time series Offset and trends by which the NTL time series of each station and component are reduced (see above). The values are provided for both, the CM- and the CF-referred NTL series.
Post-seismic deformation (PSD) time series until epoch 2031-01-01 (approximation result) Approxiation of post-seismic deformation provided in form of time series for each affected station and per component [X,Y,Z].
A short description of the DTRF2020  

 

DTRF2020 Application

  1. SLR range biases and GNSS satellite antenna phase center offsets to be used for scale consistency.

  • For SLR applications, mean range biases as provided in the ILRS data handling file have to be applied.
  • For GNSS applications, we recommend to use the satellite antenna phase center corrections of ESA antex file esa23_2303.atx . The file contains manufacturer calibration values of Galileo, GPS Block IIIA and QZSS satellites; phase center corrections of all other satellites are estimated consistenly to these calibration values and are therefore consistent to the DTRF2020 scale. For station antennas, the phase center corrections from the continuously updated file igs20.atx should be used.

  1. Addition of PSD approximation time series to DTRF2020 linear station motions provides the full post-seismic motion for stations affected by an earthquake

  2. Addition of NTL model time series referring to CM provides geocentric station position time series1 including the non-tidal loading signal. For the extrapolation of DTRF2020 please use the NTL series provided by GGFC on the website http://loading.u-strasbg.fr/ITRF2020/displa/CM/. ERA5_IB_notide, ERA5_TUGO_notide and ERA5_hydro are the respective atmospheric, oceanic and hydrological non-tidal loading components. For a correct continuation of the series applied in DTRF2020 it is important to reduce the GGFC data by the offsets and drifts by which also the series applied in DTRF2020 were reduced. The offsets and drifts are provided in the DTRF2020 release (see above).

  3. Addition of NTL model time series referring to CF provides station position time series referring to the center of figure including the non-tidal loading signal of the respective station only. For the extrapolation of DTRF2020 please use the NTL series provided by GGFC on the website http://loading.u-strasbg.fr/ITRF2020/displa/CF/. ERA5_IB_notide, ERA5_TUGO_notide and ERA5_hydro are the respective atmospheric, oceanic and hydrological non-tidal loading components. For a correct continuation of the series provided in the DTRF2020 release, please reduce the GGFC data by the offsets and drifts also provided for the CF-related NTL displacements in the DTRF2020 release (see above).

  4. DTRF2020 EOP are consistent with the linear DTRF2020 (SINEX files). Applying DTRF2020 with adding the NTL displacements to the linear station positions means that the resulting non-linear station positions are not fully consistent with the DTRF2020 EOP.

  5. The SLR translation time series represent the geocenter variations of the SLR weekly/fortnightly solutions, calculated with the reduction of NTL, with respect to DTRF2020. I.e., the fraction of the variation induced by mass re-distributions in atmosphere, ocean and hydrology, as captured by the NTL models, is not included in the time series. The annual signal is therefore correspondingly small.

1referring to the CM, as represented by SLR in long-term linear mean plus non-linear variations provided by the NTL models

Deutsches Geodätisches Forschungsinstitut

Contact:

Dr.-Ing. Manuela Seitz
manuela.seitz@tum.de

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