Example of a Large Difference Between Geoid12B and Geoid18 in Western North Carolina (Screenshot: National Geodetic Survey)

How to use the NGS Beta GEOID18 web map

June 5, 2019

This column discusses the results of the National Geodetic Survey (NGS) beta hybrid Geoid18 model and the differences […]

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This article is tagged with David B. Zilkoski, GEOID12B, GEOID18, GPS on BMs program, hybrid geoid model, National Geodetic Survey, NGS and posted in Opinions, Survey

Photo: National Geodetic Survey

A look at NGS’ experimental and hybrid geoid models

December 5, 2018

On Aug. 10, the National Geodetic Survey (NGS) released its latest experimental geoid model, xGeoid18. In early 2019, […]

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This article is tagged with David B. Zilkoski, experimental geoid models, GEOID18, hybrid geoid model, NAPGD2022, National Geodetic Survey, NGS, xGeoid18 and posted in Opinions, Survey