ILRS Workshop, Poznan, Poland, October 2008 1 Status of ITRF Development and SLR Contribution Zuheir...
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![Page 1: ILRS Workshop, Poznan, Poland, October 2008 1 Status of ITRF Development and SLR Contribution Zuheir Altamimi Xavier Collilieux David Coulot IGN France.](https://reader036.fdocuments.us/reader036/viewer/2022062421/56649d415503460f94a1b2ff/html5/thumbnails/1.jpg)
1ILRS Workshop, Poznan, Poland, October 2008
Status of ITRF Development and SLR Contribution
Zuheir AltamimiXavier Collilieux
David CoulotIGN France
Key Word: Vertical Velocities and GIA
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2ILRS Workshop, Poznan, Poland, October 2008
Warning
• Preliminary analysis
• SLR Analyzed Solutions are not official ILRS products
• ILRS reprocessed combined solution not yet available
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3ILRS Workshop, Poznan, Poland, October 2008
Outline
• Focus on SLR contribution– Origin & Scale
– Vertical Velocities & GIA model (?)
• Analyzed solutions:– IVS official combined time series
– ASI-12
– GRGS-11
– NCL (Philip Moore): Not yet an Official ILRS AC
– Test SLR solutions (David Coulot):• Solution per satellite (L1 & L2)
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4ILRS Workshop, Poznan, Poland, October 2008
ITRF and Science Requirement
• Long-term stable ITRF: 0.1 mm/yr
• Stable: linear behaviour of the TRF parameters, i.e. with no discontinuity :
– Origin Components: 0.1 mm/yr
– Scale 0.01 ppb/yr (0.06 mm/yr)
• Current situation: probably not better than
1 mm/yr
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5ILRS Workshop, Poznan, Poland, October 2008
Current ITRF Derivation
TRF (X, V)+ EOP (SINEX)
TRF (X, V)+ EOP (SINEX)
TRF (X, V)+ EOP (SINEX)
TRF (X, V)+ EOP (SINEX)
Local Ties CombinationITRF
Stacking
S1 S2 S3 Sn…VLBI
SLR
GPS
DORIS
TRF (X, V)+ EOP (SINEX)
Step 1
Step 2
W1 W2 Wn…
W1 W2 Wn…
W1 W2 Wn…
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6ILRS Workshop, Poznan, Poland, October 2008
Intrinsic Conditions
• Preserve the intrinsic origin of SLR– Seen as No-Net-Translation condition
– Preserve/Realize the long-term CoM as sensed by SLR
• Preserve the intrinsic scale of SLR & VLBI
&
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7ILRS Workshop, Poznan, Poland, October 2008
Origin and Scale wrt ITRF2005
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8ILRS Workshop, Poznan, Poland, October 2008
Origin and Scale wrt ITRF2005
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9ILRS Workshop, Poznan, Poland, October 2008
Origin and Scale wrt ITRF2005
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10ILRS Workshop, Poznan, Poland, October 2008
IGN SLR Origin & Scale ITRF2005Contribution by David Coulot
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11ILRS Workshop, Poznan, Poland, October 2008
IGN SLR Origin & Scale ITRF2005Contribution by David Coulot
4.3 mm 1.0 mm
1.4 mm 0.36 ppb
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12ILRS Workshop, Poznan, Poland, October 2008
IGN SLR Origin & Scale ITRF2005Contribution by David Coulot
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13ILRS Workshop, Poznan, Poland, October 2008
IVS Scale (ppb) wrt ITRF2005Mean Pole Tide Corrected
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14ILRS Workshop, Poznan, Poland, October 2008
IVS and SLR (ASI-12) Scale (ppb) wrt ITRF2005
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15ILRS Workshop, Poznan, Poland, October 2008
Origin, Scale & Vertical Velocities
• Vertical velocities depend on
– Z-Translation rate:
– Scale rate : ratio 1 to 1
• But Vertical velocities should reflect geophysics (GIA)
)sin(. zT
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16ILRS Workshop, Poznan, Poland, October 2008
Illustration of Origin, Scale drift on Vertical Velocities
Impact of 1.8 mm/yrTz drift (VLBI Network)
Impact of -0.2 ppb/yrScale drift(SLR Network)
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17ILRS Workshop, Poznan, Poland, October 2008
VLBI and SLR Co-located (with GPS) Sites
Two different network shapes
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18ILRS Workshop, Poznan, Poland, October 2008
Peltier, ICE-5G V1.2, Earth VM4 UP velocitiesat ITRF2005 sites
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19ILRS Workshop, Poznan, Poland, October 2008
UP Velocitity Differences ASI-12 -IVS (ITRF2005 origin)
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20ILRS Workshop, Poznan, Poland, October 2008
ASI-12 UP velocities at Co-location sitesIntrinsic Origin and Scale
Mean = - 0.36 mm/yrWeighted Mean = - 0.24
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21ILRS Workshop, Poznan, Poland, October 2008
ASI-12 UP velocities & GIA correctedat Co-location Sites (Intrinsic Origin and Scale)
Mean = - 0.32 mm/yrWeighted Mean = +0.16
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22ILRS Workshop, Poznan, Poland, October 2008
IVS UP velocities at Co-location sitesIntrinsic Scale, Origin from SLR(ITRF2005)
Mean = +0.96 mm/yrWeighted Mean = +0.89
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23ILRS Workshop, Poznan, Poland, October 2008
IVS UP velocities & GIA correctedat Co-location Sites
Intrinsic Scale, Origin from SLR(ITRF2005)
Mean = +0.94 mm/yrWeighted Mean = +1.26
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24ILRS Workshop, Poznan, Poland, October 2008
IVS UP velocities at Co-location sitesIntrinsic Scale, Origin from SLR(ITRF2000)
Mean = +0.19 mm/yrWeighted Mean = -0.24
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25ILRS Workshop, Poznan, Poland, October 2008
IVS UP velocities & GIA correctedat Co-location Sites
Intrinsic Scale, Origin from SLR(ITRF2000)
Mean = +0.18 mm/yrWeighted Mean = +0.13
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26ILRS Workshop, Poznan, Poland, October 2008
Concluding Remarks• Preliminary analysis: to be repeated with official ILRS
reprocessed solution• Vertical velocity differences ( and hence scale rate diff. )
btw IVS and ASI-12 are most likely due to: – Different network shapes to infer similar GIA effect– ITRF origin (ITRF2005 vs ITRF2000 ?)
• Accuracy of vertical velocities is probably not better than 1 mm/yr
• GPS/IGS dense network is useless without SLR & VLBI
• Continuous observations by space techniques are fundamental
• Equally fundamental is the improvement of the geodetic infrastructure