NGS has implemented the new International Terrestrial Reference Frame 2020 (ITRF2020) and IGS20 realizations in the U.S. National Spatial Reference System (NSRS) in order to maintain consistency with the International Earth Rotation and Reference System Service (IERS) and the International GNSS Service (IGS) reference frames. This results in updated North American Datum 1983 (NAD 83) coordinates for stations in the NOAA CORS Network (NCN), kept at epoch 2010.0. This update is called the Multi-Year CORS Solution 3 (MYCS3) and it follows NGS’s MYCS2 effort from 2018.
What’s new?
This update to the NSRS has been implemented.
- New coordinate functions for NOAA CORS Network (NCN) stations consistent with ITRF2020
- Datasheets will display new NAD 83 coordinates transformed from ITRF2020 coordinate functions. The new NAD 83 coordinates will remain at reference epoch 2010.0
- Position and Velocity (P&V) files will display coordinates/velocities in both NAD 83 and ITRF2020
- The NGS Online Positioning Users Service (OPUS) will begin processing data with NCN control that is consistent with ITRF2020 at the time of measurement; results will still be transformed to NAD83 at epoch 2010.0.
Background:
On October 2, 2022, the International Earth Rotation and Reference System Service (IERS) released a new realization of the International Terrestrial Reference Frame called ITRF2020. The new frame supersedes the previous version called ITRF2014. The ITRF2020 release was followed shortly by the release of a new frame realization by the International GNSS Service (IGS) called IGS20 which is closely related to ITRF2020. Learn more in the Multi-Year CORS Solution v3 (MYCS3) webinar.
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