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In 2007, NGS began planning for the modernized NSRS, acquiring its first airborne gravimeter, creating and initiating the Gravity for the Redefinition of the American Vertical Datum (GRAV-D) project and by 2008 had codified its modernization plans into a Ten Year Plan. Since then, NGS has completed the airborne gravity collection and the geoid that was derived from that data is nearly complete.
As part of a Federal Register Notice in October 2024, NGS released the following key details for the transition to the new datums in the modernized NSRS to help users and interested parties prepare for the coming change:
To get the latest news on NSRS modernization and track our progress, subscribe to NGS News or visit our "New Datums" web pages.
Further details, and more answers are available on this FAQ.