Download - ITRF2014 Network
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EUREF Tutorial, San Sebastian, Spain, May 24, 2016
Zuheir Altamimi,
E-mail: [email protected]
ITRF2014 and its application to Europe
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EUREF Tutorial, San Sebastian, Spain, May 24, 2016
Key Points
• ITRF2014 Network
• Modelling of non-linear station motions
– Periodic signals: annual, semi-annual
– Post-Seismic Deformation (PSD)
• ITRF2014 horizontal & vertical velocity fields
• Implications to ETRS89 realization
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EUREF Tutorial, San Sebastian, Spain, May 24, 2016
ITRF2014 Network : SLR
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EUREF Tutorial, San Sebastian, Spain, May 24, 2016
ITRF2014 Network: VLBI
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EUREF Tutorial, San Sebastian, Spain, May 24, 2016
ITRF2014 Network: DORIS
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EUREF Tutorial, San Sebastian, Spain, May 24, 2016
ITRF2014 Network
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EUREF Tutorial, San Sebastian, Spain, May 24, 2016
ITRF2014: GNSS
884 sites
1054 stations
1882 discontinuities
Site #
696
188
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EUREF Tutorial, San Sebastian, Spain, May 24, 2016
Periodic Signals
• Loading effects:
– Atmosphere
– Terrestrial water (Hydrology)
– Ocean circulation
==> Annual, semi-annual, inter-annual, but also short
periods (e.g. daily) variations
• Technique systematic errors, e.g. GPS draconitic
year (351.4 days) and its harmonics
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EUREF Tutorial, San Sebastian, Spain, May 24, 2016
Periodic SignalsAnnual & semi-annual terms
estimated, using:
total sum of all frequencies
number of frequencies
period of the ith frequency
==> 6 parameters per station & per frequency, i.e. a & b
along each X, Y, Z axis.
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EUREF Tutorial, San Sebastian, Spain, May 24, 2016
Periodic SignalsAnnual & semi-annual terms
estimated, using:
total sum of all frequencies
number of frequencies
period of the ith frequency
==> 6 parameters per station & per frequency, i.e. a & b
along each X, Y, Z axis.
![Page 11: ITRF2014 Network](https://reader031.vdocuments.mx/reader031/viewer/2022030323/58a2dfda1a28ab37018b7f95/html5/thumbnails/11.jpg)
EUREF Tutorial, San Sebastian, Spain, May 24, 2016
Impact of estimating seasonal signals
• Negligible impact on horizontal velocities
• Up to 1 mm/yr change in vertical velocities, for stations with
large seasonal signals, large number of discontinuities,
or/and data gaps in time series
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EUREF Tutorial, San Sebastian, Spain, May 24, 2016
Post-Seismic Deformations
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EUREF Tutorial, San Sebastian, Spain, May 24, 2016
ITRF2014 Sites affected by PSD
Red Stars: EQ Epicenters
Green circles: ITRF2014 sites
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EUREF Tutorial, San Sebastian, Spain, May 24, 2016
Post-Seismic Deformations
• Fitting parametric models using GNSS/GPS data
– at major GNSS/GPS Earthquake sites
– apply these models to the 3 other techniques at
co-location EQ sites
• Parametric models:
– Logarithmic
– Exponential
– Log + Exp
– Two Exp
Post-seismic deformation
Earthquake
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EUREF Tutorial, San Sebastian, Spain, May 24, 2016
PSD Correction
Regularized Position (ITRF2014)
Observed Position
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EUREF Tutorial, San Sebastian, Spain, May 24, 2016
How to use ITRF2014 PSD models ?
Local Frame
Regularized Position (ITRF2014)
PSD Subroutines available at ITRF2014 Web site:
http://itrf.ign.fr/ITRF_solutions/2014/
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EUREF Tutorial, San Sebastian, Spain, May 24, 2016
Tsukuba TrajectoryGPS VLBI
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EUREF Tutorial, San Sebastian, Spain, May 24, 2016
TUBI ISTA
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EUREF Tutorial, San Sebastian, Spain, May 24, 2016
BUCU REYK
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EUREF Tutorial, San Sebastian, Spain, May 24, 2016
ANKR
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EUREF Tutorial, San Sebastian, Spain, May 24, 2016
ITRF2014 Frame Specification • Origin: SLR: Zero translation or translation rate between
ITRF2014 and SLR frame
• Scale: Arithmetic average of VLBI & SLR intrinsic scales:
Zero scale or scale rate between ITRF2014 & the VLBI &
SLR average
• Orientation : Zero rotation and rotation rate WRT
ITRF2008, using 127 RF stations:
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EUREF Tutorial, San Sebastian, Spain, May 24, 2016
DORIS, SLR & VLBI scales wrt ITRF2014
Full time series of scale factorsScale factors of SLR and VLBI solutions
selected to define ITRF2014 scale
VLBISLRDORIS
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EUREF Tutorial, San Sebastian, Spain, May 24, 2016
ILRS/SLR origin components wrt ITRF2014
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EUREF Tutorial, San Sebastian, Spain, May 24, 2016
ILRS/SLR origin components wrt ITRF2014
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EUREF Tutorial, San Sebastian, Spain, May 24, 2016
From ITRF2014 to ITRF2008
TX(mm) TY(mm) TZ(mm) Scale (ppb) Epoch
Offset
±1.6
±0.2
1.9
±0.1
2.4
±0.1
-0.01
±0.02
2010.0
Rate
±0.1
±0.2
0.0
±0.1
-0.1
±0.1
0.03
±0.02
-
Using 127 stations
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EUREF Tutorial, San Sebastian, Spain, May 24, 2016
ITRF2014: Horizontal velocity field
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EUREF Tutorial, San Sebastian, Spain, May 24, 2016
ITRF2014: Vertical velocity field
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EUREF Tutorial, San Sebastian, Spain, May 24, 2016
Différences ITRF2014 – ICE6G
mm/an
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EUREF Tutorial, San Sebastian, Spain, May 24, 2016
Transfo ITRF2014 ==> ETRF2008
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EUREF Tutorial, San Sebastian, Spain, May 24, 2016
Conclusion• ITRF2014 innovations:
• Estimating seasonal signals
– No significant impact on horizontal velocities
• Precise modeling of Post-Seismic deformations
• Transformation parameters between ITRF2014 &
ITRF2008 are small
• Transformation parameters from ITRF2014 to
ETRF2000 are straightforward
• TWG might recommend an ETRF2014 frame
instead of ETRF2000