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

Image: National Geodetic Survey

NGS 2018 GPS on BMs program in support of NAPGD2022 — Part 8

August 1, 2018

My last two columns (NGS 2018 GPS on BMs program in support of NAPGD2022 — Part 6 and […]

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This article is tagged with David B. Zilkoski, GEOID12B, GEOID18, GPS on BMs program, NAPGD2022, National Geodetic Survey, NAVD 88, NGS 2018, OPUS and posted in Opinions, Survey

Image: NOAA's National Geodetic Survey

NGS 2018 GPS on BMs program in support of NAPGD2022 — Part 5

February 7, 2018

My last column highlighted two components of the North American-Pacific Vertical Datum of 2022 (NAPGD2022) — the geoid undulation […]

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This article is tagged with David B. Zilkoski, GPS on Bench Marks Program, GPS on BMs program, NAPGD2022, National Geodetic Survey, NGS and posted in Opinions, Survey