California Surveyors Forums

On Friday, February 25, 2011 at 1300h-1430h EST, NGS will host a webinar
focused on describing the forthcoming change in coordinates (position and
velocities) for CORS sites from ITRF2000 epoch 1997.0 and NAD 83(CORS96)
epoch 2002.0. The new coordinates will be available in NGSTRF08 epoch
2005.0
and NAD 83(CORS96A) epoch 2010.0. The underlying datum for NGSTRF08 is
based on ITRF2008, but the positions are calibrated for the impending
release of IGS08 (+igs08.atx). In this webinar, we will describe the:
- methodology used to establish the new coordinates
- magnitude of the coordinate changes
- implications for post-processing applications outside of NGS.e.g. holding
CORS with fixed positions and use of absolute (vs. relative) antenna
calibrations
- time-frame for the distribution of coordinates

The presentation will be short with an extended period for participants
to share concerns and ask questions. This will be the first of a regular
series of presentations on this transition.

The presentation will be given by Giovanni Sella and Jake Griffiths,
and is open to everyone.

The meeting will be via GoToMeeting via the following link
https://www2.gotomeeting.com/register/122817186

Call in number will be available shortly
please check this newsletter
http://www.ngs.noaa.gov/CORS/news.shtml

For any questions please contact giovanni.sella @ noaa.gov

The call-in info is as follows:
Call in number is:
US: 888-946-7792
Passcode: 35813

This webinar will be repeated on Tuesday March 8 2011 1300h-1430h EST. However, note that this time period is during the CLSA conference.

I recently learned that I have mis-informed people in presentations I have made in the past few months on this topic. I had been saying that the epoch that NGS would use for ITRF08 would be 2008.00, but in fact, the official epoch, which we will be adopting, is 2005.00. My apologies.