DTRF2020

When using this data please cite Seitz, M., Bloßfeld, M., Angermann, D., Glomsda, M., Rudenko, S., Zeitlhöfler, J., & Seitz, F. (2023). DTRF2020 (Version v2) [Data set]. Zenodo. https://doi.org/10.5281/zenodo.8369167

A reference paper describing the DTRF2020 in detail is in progress. More information on the DTRF2020 and to individual stations are given at the webpage https://dtrf.dgfi.tum.de/en/dtrf2020/

Summary
The DTRF2020 is an independent realization of the International Terrestrial Reference System, ITRS (Petit and Luzum, 2010), by DGFI-TUM. It was computed in 2021/2022 and is based on input data provided by the IAG Scientific Services of the four geodetic space techniques VLBI, SLR, GNSS and DORIS (IVS, ILRS, IGS, IDS). The observation time spans cover 27 to 41 years until the end of 2020.
DTRF2020 is characterized by the following innovations.

Innovations since the previous ITRS realization, DTRF2014 (Seitz et al., 2022):

• Six more years of observation data.
• New stations, satellites and technically improved stations.
• The technique-specific input data series are calculated according to the latest general and technique-specific models.
• GNSS provides for the first time an independent scale realization, made possible by the disclosure of the Galileo satellite calibrations.
• For DTRF2020 the scale is realized for the first time from VLBI and GNSS observations.
• DTRF2020 considers for the first time all three components of non-tidal loading: the atmospheric, the hydrological and the oceanic part, consistently derived by the Global Geophysical Fluid Center, GGFC. The data cover the full observation time span of the space-geodetic techniques (1979 - 2021.0).
• For the first time, post-seismic deformation (PSD) of stations affected by earthquakes are modelled and considered in the DTRF computation.

An interactive map providing information on the individual stations is available at https://dtrf.dgfi.tum.de/en/dtrf2020/interactive-map/.

Updates

Version v2: 2023-09-22 (see also IERS Message No. 489)

• non-tidal loading (NTL) time series  referring to CM and CF and the files listing the offsets and trends by which the time series are reduced.
• post-seismic deformation (PSD) time series for GILCREEK/VLBI
• DTRF2020 solution description

Data Format Description

• SINEX files of DTRF2020 per technique with full variance-covariance matrix (note: there is a list of GNSS stations without DOMES numbers)
  • DTRF2020_{technique}.snx.gz
• EOP file of DTRF2020 in IERS 20 C04 format
  • DTRF2020_EOP.20C04_format.txt
• NTL corrections in [x,y,z] and [North,East,up] applied in DTRF2020 as time series per station. The time series refer to the center of mass of the Earth (CM). In addition, we provide NTL series referring to the center of figure (CF) of the Earth in the same format. Both types of series are provided from the respective start of the observation period of a technique until 2021.0. The NTL series are reduced by offset and drift obtained for the valid observation time span of the individual station. The offsets and drifts are also provided (see below).
  • NTL_{CM|CF}_{technique}_{xyz|neu}.tar
• Mean offsets and drifts removed from individual NTL correction time series before applying them in DTRF2020 (for atmospheric, hydrological and oceanic effect and the sum) in [x,y,z] and [North,East,up]. The values are provided for the applied CM-referred series and for the CF-referred series (see above).
  • NTL_{CM|CF}_{technique}_reduced_offsets_and_drifts.tar
• PSD corrections as time series in [x,y,z] applied in DTRF2020 for stations affected by a significant post-seismic deformation. For solution numbers whose observation period extents beyond the end of the DTRF2020 period, long time series are provided up to epoch 2031-01-01.
  • PSD_{technique}.tar
• Station position residual time series in [North, East, up] resulting from 7-parameter similarity transformations of technique-specific solution series with respect to DTRF2020. Important note: The solution series for the individual techniques are based on the NEQs that are used for the DTRF2020 calculation, i.e., on NEQs reduced by the NTL displacements.
  • Station_Residual_Time_Series_{technique}.tar
• SLR translation time series with respect to DTRF2020
  • SLR_translation_wrt_DTRF2020.txt