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New NGS study examines GIS surveys for airports

August 14, 2020

A new study for the National Geodetic Survey (NGS) reviews and validates airport surveys from a safety perspective. […]

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This article is tagged with FAA, GIS, Irv Leveson, National Geodetic Survey, NGS, scoping study and posted in Latest News, Transportation

Figure 2 – Approximate Change Between NAPGD2022 and NGVD 29 Using GPS on BMs Data (units = cm). (Image: National Geodetic Survey)

NGS releases modernized National Spatial Reference System updates

August 5, 2020

The National Geodetic Survey (NGS) recently announced two new items related to the modernized National Spatial Reference System […]

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This article is tagged with David B. Zilkoski, modernized NSRS, National Geodetic Survey, National Spatial Reference System, NGS, NSRS and posted in Opinions, Survey

David B. Zilkoski

Number of trained US geodesists at crisis level

July 20, 2020

By David Zilkoski, contributing editor, survey scene I attended The Ohio State University (OSU) to obtain my graduate […]

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This article is tagged with David B. Zilkoski, First Fix, geodesists, geodesy, Google FedEx, location-based services, National Geodetic Survey, navigation, precision agriculture, Smart Cities, The Ohio State University, United States and posted in Opinions, Survey

Image: National Geodetic Survey

Why users will need to perform GNSS occupations as part of a leveling project after 2022

June 3, 2020

This column will address why users will be required to perform GNSS occupations when submitting a leveling project […]

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This article is tagged with David B. Zilkoski, GNSS occupations, National Geodetic Survey, NGS and posted in Opinions, Survey

Image: National Geodetic Survey

The differences between published Geoid18 and Geoid12B values in Southern Louisiana

April 1, 2020

My February 2020 column provided an analysis of the differences between the latest published hybrid Geoid18 values provided […]

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This article is tagged with David B. Zilkoski, GEOID12B, GEOID18, GEOID18 Gulf Coast, GPS data, GPS on Bench Marks, National Geodetic Survey, NGS, Southern Louisiana and posted in Opinions, Survey

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

Figure 27: GRACE Trend over CONUS from UTCSR RL06 Model [mm/yr] (Source: Figure 27 from Technical Report NOS NGS 69)

How NGS can implement a time-dependent geopotential datum

December 4, 2019

The National Geodetic Survey (NGS) has published a technical report that describes options for how NGS can implement […]

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This article is tagged with David B. Zilkoski, DGEOID2022, geoid model, geopotential datum, GRACE data, National Geodetic Survey, NGS and posted in Opinions, Survey

Image: National Geodetic Survey/Michael Dennis

New developments coming with the NGS 2022 datum change

November 6, 2019

A famous quote applies to almost everything in our lives: “There is nothing permanent except change.” This well-known […]

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This article is tagged with National Geodetic Survey, NGS, NGS 2022 datum change, survey, Tim Burch and posted in Opinions, Survey