USACE ECB 2023-3 Use of National Geodetic Survey NCAT and VDatum instead of CORPSCON -- Category: Directive and Information  

This ECB establishes U.S. Army Corps of Engineers (USACE) policies for the transformation and conversion of geospatial coordinates from one datum and/or coordinate system to another. It specifically addresses the valid datum transformation and coordinate conversion tools that should be used in these processes. Its purpose is to ensure that datum transformations and coordinate conversions are done utilizing the most up to date methods developed by the National Oceanic and Atmospheric Administration (NOAA), National Geodetic Survey (NGS) and/or NOAA National Ocean Service (NOS). This ECB does not address transformations that involve the World Geodetic System 1984 (WGS 84) or any of the International Terrestrial Reference Frames (ITRFs).