Kerguelen

 

KERA 91201S002

KERB 91201S003

KESB 91201S004

KETB 91201S005

 

DM#493 KETB new station since 11-APR-2007

 

IDS KESB break on 01-JAN-2004

 

ITRF KESB break on 01-JAN-2004

 

KETB is not in ITRF2005

 

Preliminary computations:

 

KESB in ITRF2005 (before the break) is:

 

KESB 2000.0 1406334.550 3918142.337 -4816185.054 -5.73 -0.10 -5.84

 

KESB in ITRF2005 (after break is called KES1) is

 

KES1 2000.0 1406334.522 3918142.353 4816185.043 -5.73 -0.10 -5.84

 

So the break is significant (3 cm in X)

 

From geodetic local tie, we have

 

KETB 91201S005 KESB 91201S004 -0.069 -0.197 0.240 0.001

 

In ITRF2005, we have

 

KESB 2000.0 1406334.550 3918142.337 -4816185.054 -5.73 -0.10 -5.84

 

So, we obtain

 

KETB 2000.0 1406334.619 3918142.534 -4816185.294 -5.73 -0.10 -5.84

 

DORIS solution (tf_070515a) using ITRF2005 fixed velocity is not yet possible (no data yet)

 

Using more recent DORIS data (ign07d02)

 

2000.0 KETB 1406334.6067 3918142.5539 -4816185.2663 -5.73 -0.10 -5.84

statistics KETB XYZ 0.0028 0.0017 0.0014 35

 

good agreement

 

Need further investigation

 

Recommendation:

 

KESB break on 01-JAN-2004

Estimate KETB using local tie + verify with DORIS DORIS data