![]() ![]() NOAA Technical Report NOS NGS 68 (PDF, 8 MB) provides detailed information on VERTCON 3.0, and the digital archive includes plots and data. Datum conversions from the National Geodetic Vertical Datum of 1929 to the North American Vertical Datum of 1988 among inland and coastal gages throughout the hydrologic regions of New England, the Mid-Atlantic, and the South Atlantic-Gulf have implications among river and storm surge forecasting, general commerce, and water-control operations. Visit the VERTCON 3.0 Digital Archive to access raw transformation data that make up VERTCON 3.0 release 20190601 (e.g., grids, images, software). Unlike earlier versions of VERTCON, VERTCON 3.0 release 20190601 is not a stand-alone tool. VERTCON 3.0 release 20190601 is functionally implemented in NGS’s Coordinate Conversion and Transformation Tool (NCAT). ![]() VERTCON 3.0 release 20190601 adds support for vertical datums on islands and Alaska, and the VERTCON 3.0 build software prepares NGS for the upcoming NAPGD2022 release. The actual transformation tool is NGS’s Coordinate Conversion and Transformation Tool (NCAT), in which VERTCON 3.0 release 20190601 is but one part. However VERTCON is no longer the name of a stand-alone transformation tool. The grids in VERTCON 3.0 release 20190601 are replacements for those in VERTCON 2.1, which transformed only between NGVD 29 and NAVD 88 for CONUS. Those new grids (and supporting information) are called VERTCON 3.0 release 20190601. VERTCON 3.0 was a project whose intent was to create new “build software”, and use that software to build and release transformation grids capable of performing orthometric height transformations for a range of datums and regions in the National Spatial Reference System. ![]()
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