Re: Report of Leap Second Problem with GPS Data
On Jan 13, 2006, at 6:26 AM, Richard Langley wrote: FYI. Thanks! Actual reports from the field, how novel! ** IGS Station Mail 12 Jan 14:59:42 PST 2006 Message Number 760 ** Author: Michael Moore Geoscience Australia Australian Regional GPS Network Geodetic Operation ADVISORY: High rate data, 1Hz 15 minute files, from the ARGN suffered a software problem due to the recently introduced UTC leap-second. Data from DOY 001 to DOY 009 is 1s off in the timestamps reported n the RINEX files. This problem only applies to the 1Hz 15minute files submitted from the ARGN. The software problem has been fixed, and all files from DOY 010 is reporting the correct time. RINEX headers for DARR from DOY 009, was incorrectly reporting an antenna height of 0.000. The headers have now been fixed to report the correct antenna height of 0.0025, and the data from DOY 009 has been resubmitted with the correct header information. I won't claim to know the intrinsic importance attached to this. Critical systems may depend on the information. But is it fair to sum up the situation by saying that a leap second triggered a couple of bugs (or perhaps one common bug), they were detected, have been fixed, and affected data products have been remediated? Also, it appears that some other data products were unaffected? So, the issue has been resolved - would likely have been resolved sooner if a leap second had occurred earlier - and is no longer directly pertinent to a discussion of future leap seconds? Well done, Geoscience Australia! Rob Seaman NOAO
Re: Report of Leap Second Problem with GPS Data
In message [EMAIL PROTECTED], Rob Seaman writes: I invite derision with my flights of rhetoric. As published papers [1] document, you have way to go. Poul-Henning [1] George August, Anita Balliro et all, study of Rotation of the Earth, approx 1993. (find it yourself). -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 [EMAIL PROTECTED] | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.
Report of Leap Second Problem with GPS Data
FYI. -- Richard Langley Professor of Geodesy and Precision Navigation === Richard B. LangleyE-mail: [EMAIL PROTECTED] Geodetic Research Laboratory Web: http://www.unb.ca/GGE/ Dept. of Geodesy and Geomatics EngineeringPhone:+1 506 453-5142 University of New Brunswick Fax: +1 506 453-4943 Fredericton, N.B., Canada E3B 5A3 Fredericton? Where's that? See: http://www.city.fredericton.nb.ca/ === -- Forwarded message -- Date: Fri, 13 Jan 2006 09:59:31 +1100 From: [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: [IGSSTATION-760]: DARR and 1Hz data from ARGN ** IGS Station Mail 12 Jan 14:59:42 PST 2006 Message Number 760 ** Author: Michael Moore Geoscience Australia Australian Regional GPS Network Geodetic Operation ADVISORY: High rate data, 1Hz 15 minute files, from the ARGN suffered a software problem due to the recently introduced UTC leap-second. Data from DOY 001 to DOY 009 is 1s off in the timestamps reported n the RINEX files. This problem only applies to the 1Hz 15minute files submitted from the ARGN. The software problem has been fixed, and all files from DOY 010 is reporting the correct time. RINEX headers for DARR from DOY 009, was incorrectly reporting an antenna height of 0.000. The headers have now been fixed to report the correct antenna height of 0.0025, and the data from DOY 009 has been resubmitted with the correct header information. I apologise for any inconvenience this may cause. Regards Mike * Michael Moore Geodetic Operations Geoscience Australia Earth Monitoring Group (GEM) http://www.ga.gov.au/ Telephone: (+61 2) 62499052 Fax: (+61 2) 62499929 Email: [EMAIL PROTECTED] GPO Box 378 Canberra ACT 2601 Australia *
