Image: National Geodetic Survey

The differences between Geoid18 values and NAD 83, NAVD 88 values

February 5, 2020

My last column, December 2019, highlighted the National Geodetic Survey’s (NGS) new Geoid Monitoring Service (GeMS); and, that […]

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This article is tagged with David B. Zilkoski, GEOID18, NAD 83, National Geodetic Survey, NAVD 88, 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

Figure 1 – Approximate Change Between NAPGD2022 and NAVD 88 Using GPS on BMs Data (units = cm). (Image: National Geodetic Survey)

Discussing the new North American-Pacific Geopotential Datum of 2022 — Part 1

June 7, 2017

On April 24-25, 2017, the National Geodetic Survey (NGS) hosted the 2017 Geospatial Summit in Silver Spring, Maryland, […]

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This article is tagged with David B. Zilkoski, NAD 83, National Geodetic Survey, NAVD 88, NGS, North American Datum of 1983, North American Vertical Datum of 1988, North American-Pacific Geopotential Datum of 2022 and posted in Opinions, Survey