David B. Zilkoski

Image: National Geodetic Survey

February 5, 2020

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

By David B. Zilkoski

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

December 4, 2019

How NGS can implement a time-dependent geopotential datum

By David B. Zilkoski

Image: National Geodetic Survey

October 2, 2019

NGS releases beta version of NCAT 2.0

By David B. Zilkoski

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

June 5, 2019

How to use the NGS Beta GEOID18 web map

By David B. Zilkoski

Photo: National Geodetic Survey

April 3, 2019

NGS releases beta coordinates and multi-year CORS solution

By David B. Zilkoski

Sources: Esri, DeLorme, USGS, NPS, NOAA

February 6, 2019

NGS to perform another Multi-Year CORS Solution

By David B. Zilkoski

Photo: National Geodetic Survey

December 5, 2018

A look at NGS’ experimental and hybrid geoid models

By David B. Zilkoski

Image: National Oceanic and Atmospheric Administration

October 3, 2018

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

By David B. Zilkoski

Image: National Geodetic Survey

August 1, 2018

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

By David B. Zilkoski

Click to enlarge. (Image: NGS)

June 6, 2018

NGS 2018 GPS on BMs program in support of NAPGD2022 — Part 7

By David B. Zilkoski

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