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Analysis and results of ITRF2014, IERS Technical Note No. 38


Year: 2017
Language: english
Author: International Earth Rotation and Reference Systems Service (IERS)
Genre: Technical book
Format: PDF
Quality: eBook
Pages count: 76
Description: The ITRF2014 is an improved realization of the International Terrestrial
Reference System (ITRS) and is demonstrated to be of higher quality
than the past ITRF versions. It involves two main innovations dealing
with the modeling of station non-linear motions, namely seasonal
(annual and semi-annual) signals present in the time series of station
positions and post-seismic deformations for 124 sites that were subject
to major earthquakes. It is achieved through a two-step procedure:
(1) stacking the time series of station positions and Earth Orientation
Parameters (EOPs) provided by the four IERS Technique Centers (TC);
(2) combining the long-term solutions as obtained in step 1, together
with local ties in co-location sites. The two-step procedure makes use
of full variance-covariance information provided in SINEX format. The
TC solutions incorporated in the ITRF2014 combination are free from
any external constraints, thus preserving the actual space geodesy estimates
of station positions and EOPs. The ITRF2014 origin is defined
in such a way that it has zero translations and translation rates with
respect to the mean Earth center of mass, as defined by the SLR station
positions time series. Its scale is defined by zero scale factor and zero
scale rate with respect to the mean of VLBI and SLR long-term solutions
as obtained by stacking their respective time series. The ITRF2014
orientation (at epoch 2010.0) and its rate are aligned to the ITRF2008
using 127 stations of high geodetic quality.
The ITRF2014 includes the positions and velocities of 1499 stations
located at 975 sites. Figure 1 shows the coverage of these sites, underlying
the co-located space geodesy techniques.
This technical note describes the main ITRF2014 products: station
positions and velocities, the post fit residuals of the least squares adjustment
as well as the transformation parameters between ITRF2014
and ITRF2008. The main technical procedure used to generate the
ITRF2014, a thorough discussion of its quality as well as most important
geodetic and geophysical results were published in Altamimi et al. [2016],
appended to this Technical Note.
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