NOAA is currently mapping a "high-resolution 'snapshot' of gravity" in the USA. Gravity for the Redefinition of the American Vertical Datum (GRAV-D)
https://www.ngs.noaa.gov/GRAV-D/index.shtml
“GRAV-D has the potential to provide very significant benefits to the public”
https://mycoordinates.org/%E2%80%9Cgrav-d-has-the-potential-to-provide-very-significant-benefits-to-the-public%E2%80%9D/