Friday, March 15, 2019

GEOID18 Products Released for Beta Testing and Public Comment

GEOID18 will provide improved GPS-derived North American Vertical Datum of 1988 (NAVD 88) equivalent heights and will be the last hybrid geoid model NGS will release before replacing the nation's current height reference frame, NAVD 88, with the North American-Pacific Geopotential Datum of 2022. NAVD 88 is based on historic geodetic leveling surveys using thousands of bench marks, most of which have not been positioned using GPS. Adding GPS coordinates to the control marks allows them to be used in NGS's modern height reference-surface modeling.

For more information, contact: Galen Scott