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The effects of vertical movement on NGS's modernized 2022 NSRS

This column addresses estimates of vertical movement that will have to be accounted for in the new, modernized National Spatial Reference System. ....

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FIG workshop delves into Great Lakes, highlights GNSS techniques - GPS World

FIG workshop delves into Great Lakes, highlights GNSS techniques - GPS World
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NGS releases annual experimental geoid models and gravity interpolation tools - GPS World

NGS releases annual experimental geoid models and gravity interpolation tools
My last column highlighted an ArcGIS web application that incorporates various datasets and data layers to assist surveyors planning vertical control surveys. On Jan, 29, the National Geodetic Survey (NGS) released the latest experimental geoid model, xGeoid20, and a new gravity interpolation tool (see box below, “NGS Releases Annual e& Gravity Interpolation Tools”).
This newsletter will highlight some attributes of these two new products. First, why am I writing about another experimental geoid model. I discussed xGeoid18 in my December 2018 column and xGeoid16 in my June 2017 column. What’s important here is that this will be the last experimental geoid model until 2022, and the dynamic geoid model has also been updated this year in the form of xDGEOID20. ....

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