Delivered-To: igsstation@igscb.jpl.nasa.gov Message-ID: <5ACEEE96F4F9D41190790002A528B51E07097765@S0-OTT-X11.NRCan.gc.ca> From: =?iso-8859-1?Q?=22Ferland=2C_R=E9mi=22?= To: "'igsstation@igscb.jpl.nasa.gov'" Subject: [IGSSTATION-333]: IGb00 Review COCO - DGAR Date: Thu, 20 Jan 2005 15:35:06 -0500 Content-Type: text/plain; charset="iso-8859-1" Sender: owner-igsstation Precedence: bulk ****************************************************************************** IGS Station Mail 20 Jan 12:35:09 PST 2005 Message Number 333 ****************************************************************************** Author: R. Ferland Dear IGS colleagues, The review at the beginning of the week [IGSSTATION-330] indicated that at station DGAR, there was the possibility of a discontinuity on Dec 26, based on GPS week 1303 IGS SINEX combination results. This week solution (GPS week 1304) confirms the observed discontinuity between GPS weeks 1302 - 1303. The discontinuity was confirmed to be about 5mm in the North and East directions, and no significant discontinuity in the vertical direction. This is based on weekly estimates of two weeks before and after Dec 26. It is suggested to remove it from the IGb00 realization list. Other reference frame stations in the South Asia region were also checked for potential discontinuity. The COCO station was also found to have a small discontinuity of about 3mm in the North direction and 1.5 in the East direction and down about 6mm based on the same weekly information and at the same epoch as DGAR. It is also suggested to remove it from the IGb00 realization list. The IGb00 SINEX files will be updated shortly. They will be located as usual at: ftp igscb.jpl.nasa.gov cd /station/coord files: IGS03P33_RS99.snx.Z IGS03P33_RS106.snx.Z (if reprocessing pre-IGS00 solutions) The discontinuity file has also been updated. It is located at: ftp macs.geod.nrcan.gc.ca cd /pub/requests/sinex/discontinuities File: ALL.snx Best regards, Remi