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dorismail               13-Apr-2010 12:53:22 Message No 0659
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Author: =?Windows-1252?Q?J=E9r=F4me_SAUNIER?= <jerome.saunier@ign.fr>
Subject: Network/ coordinates update SANTIAGO


#### BEGIN HEADER ####
DORISMail version 1.1
Subject: No 0659 : Network/ coordinates update SANTIAGO
#### END HEADER ####

Dear colleagues,

Following the magnitude 8.8 earthquake that rocked Chile on February 27th,
2010, the position of the DORIS Santiago antenna changed considerably. 

Please find below temporary coordinates until we get first results of DORIS
data analysis (it's still early).

To calculate these coordinates, we theorized that the relative position
between the DORIS antenna and the GPS antenna (SANT) is the same as before
the earthquake. Then, we used the new SANT coordinates (from the IGS
cumulative solution until 1575 week) and the velocities of the DORIS
reference point before earthquake to get coordinates at epoch 2000.0 :

Concerned site:
#### BEGIN SITE ####
Site name         : SANTIAGO ####
Site DOMES number : 41705 ####
#### END SITE ####

Characteristics of the new point:
#### BEGIN STATION ####
Four character ID           : SANB ####
Station DOMES number        : 41705S009 ####
#### END STATION ####

The coordinates of the DORIS antenna reference point are:
#### BEGIN COORDINATES ####
Solution : ITRF2005 ####
Note about the coordinates :  ####
Epoch    : 2000.0 ####
Unit     : metre ####
X        : 1769700.166 ####
Y        : -5044614.920 ####
Z        : -3468261.308 ####
Sig X    : 0.010 ####
Sig Y    : 0.010 ####
Sig Z    : 0.010 ####
#### END COORDINATES ####

The ITRF velocities for the site are:
#### BEGIN VELOCITIES ####
Note about the velocities :  ####
Unit     : metre / year ####
VX       : 0.0183 ####
VY       : -0.0025 ####
VZ       : 0.0123 ####
Sig VX   : .0005 ####
Sig VY   : .0005 ####
Sig VZ   : .0005 ####
#### END VELOCITIES ####


Best regards,


Jerome SAUNIER
Reseaux et Services Internationaux
Service de Geodesie et Nivellement
Institut Geographique National
2, avenue Pasteur
94 165 SAINT MANDE Cedex



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