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Subject: [IGSSTATION-920]: RE: [IGSSTATION-918]: Please send us
  Coordinates in day 361 Year 2005 on Frame IGb00   of COCO, GUAM, IISC,
  SHAO, WUHN
Date: Fri, 21 Apr 2006 10:52:38 -0400
Message-ID: <5ACEEE96F4F9D41190790002A528B51E07097A50@s0-ott-x11.nrcan.gc.ca>
Thread-Topic: [IGSSTATION-918]: Please send us Coordinates in day 361
  Year 2005 on Frame IGb00   of COCO, GUAM, IISC, SHAO, WUHN
Thread-Index: AcZlUzuhkuCsATqsQ7Koyp4sD/nJRw==
From: =?us-ascii?Q?Ferland=2C_Remi?= <RFerland@NRCan.gc.ca>
To: "Nguyen Tuan Anh" <tuananhrsc@gmail.com>,
  <igsstation@igscb.jpl.nasa.gov>
Sender: owner-igsstation
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******************************************************************************
IGS Station Mail          21 Apr 07:52:47 PDT 2006      Message Number 920
******************************************************************************

Author: R. Ferland

Dear Nquyen,

	You will find the station coordinates for the stations
you mentioned ( GPS week 1355; 05/12/25 - 05/12/31) at CDDIS
in file igs05p1355.snx.Z:

ftp://cddis.gsfc.nasa.gov/pub/gps/products/1355/

Note that the COCO and IISC stations were found to have experienced
a noticeable shift, due to the Sumatra earthquake that devastated
the area a few days before, see:

http://igscb.jpl.nasa.gov/igscb/mail/igsstation/333
http://igscb.jpl.nasa.gov/mail/igsstation/2005/msg00013.html

For the details about the realization of IGb00 and its
alignment to ITRF2000 as well as the transformation between
IGS00 and IGb00 see:

http://igscb.jpl.nasa.gov/mail/igsmail/2003/msg00442.html

Since IGS00 and IGb00 are both aligned to ITRF2000, the
transformation between IGS00 <-> ITRF000 and IGb00 <-> ITRF00
are null.
Note that in that e-mail, IGb00 is referred to as "IGS00 (v2)".
You will notice that the transformation IGS00 <-> IGb00 are very
small but not null due to network effects. They are negligible
for most, if not all applications.

For the case of IGS97 <-> ITRF97 the transformation should also
be null. A test done on a few weeks of data confirms that the
estimated transformation are within the noise level. Details
can be found in:

http://igscb.jpl.nasa.gov/mail/igsmail/2000/msg00245.html
http://igscb.jpl.nasa.gov/mail/igsmail/2000/msg00250.html

For the connection between the various ITRF realizations
you should consult the IERS Conventions(2003), Chapter 4:

http://www.iers.org/MainDisp.csl?pid=46-25776

If you require further information, do not hesitate to contact
me at your convenience.

Best Regards,
Remi,

> -----Original Message-----
> From: owner-igsstation@igscb.jpl.nasa.gov
> [mailto:owner-igsstation@igscb.jpl.nasa.gov]On Behalf Of
> Nguyen Tuan Anh
> Sent: April 21, 2006 4:48
> To: igsstation@igscb.jpl.nasa.gov
> Subject: [IGSSTATION-918]: Please send us Coordinates in day 361 Year
> 2005 on Frame IGb00 of COCO, GUAM, IISC, SHAO, WUHN
>
>
> **************************************************************
> ****************
> IGS Station Mail          21 Apr 01:47:54 PDT 2006
> Message Number 918
> **************************************************************
> ****************
>
> Author: TuanAnh
>
> Dear IGS Colleagues:
>
> Could you Please send us:
>
> -          Helmert Prametes Transform from IGb00 Frame to
> IGS00, ITRF00,
> IGS97, ITRF97, ITRF96, ITRF93 Frame
>
> -          Coordinates in day 361 Year 2005 on Frame IGb00
> of IGS Station
> Following:
>
>                         47  COCO 50127M001     IGb00
>
>             96  GUAM 50501M002     IGb00
>
>           119  IISC 22306M002     IGb00
>
>            286  SHAO 21605M002     IGb00
>
>            366  WUHN 21602M001     ITR00
>
>
>
> Best regards,
>
>
>
> TuanAnh
>
>
>