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

NGS releases beta version of NCAT 2.0

October 2, 2019

My last column highlighted the next phase of the National Geodetic Survey’s (NGS) GPS on Bench Marks program; […]

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This article is tagged with Beta version, David B. Zilkoski, National Geodetic Survey, NCAT 2.0, NGS, VERTCON 3.0 and posted in Opinions, Survey

Photo: National Geodetic Survey

NGS releases beta coordinates and multi-year CORS solution

April 3, 2019

My last column discussed the preliminary results of NGS’ second Multi-Year CORS Beta Solution of the National CORS. […]

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This article is tagged with Beta OPUS Project, CORS solution, David B. Zilkoski, GEOID18, MYCS2 process, National Geodetic Survey, NGS and posted in Featured Stories, Opinions, Survey

Sources: Esri, DeLorme, USGS, NPS, NOAA

NGS to perform another Multi-Year CORS Solution

February 6, 2019

The National Geodetic Survey (NGS) is performing another Multi-Year CORS Solution (MYCS) of the National CORS. This will […]

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This article is tagged with David B. Zilkoski, International Terrestrial Reference Frame of 2014, ITRF2014, Multi-Year CORS Solution, MYCS, National CORS, National Geodetic Survey, NGS and posted in Opinions

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 model, GEOID18, hybrid geoid model, NAPGD2022, National Geodetic Survey, NGS, xGeoid18 and posted in Opinions, Survey

Image: National Oceanic and Atmospheric Administration

NGS 2018 GPS on BMs program in support of NAPGD2022 — Part 9

October 3, 2018

The number of GPS on Bench Mark (BM) stations highlighted as complete on the National Geodetic Survey (NGS) […]

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This article is tagged with 2018 GPS on BMs program, David B. Zilkoski, GEOID18, GPS on Bench Mark stations, NAPGD2022, National Geodetic Survey, NGS, OPUS, OPUS Shared and posted in Opinions, Survey