Experimental Geoid Models 2020 (xGEOID20). (Image: NGS)

NGS releases annual experimental geoid models and gravity interpolation tools

February 3, 2021

My last column highlighted an ArcGIS web application that incorporates various datasets and data layers to assist surveyors […]

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This article is tagged with David B. Zilkoski, experimental geoid models, gravity interpolation tool, National Geodetic Survey, NGS, Survey Scene, xGeoid20 and posted in Opinions, Survey

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