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National Geodetic Survey - Frequently Asked Questions
https://beta.ngs.noaa.gov/datums/faq.shtml
WebWhat is a geodetic datum ? What are NAD 27 and NAD 83 ? Why did NGS change from NAD 27 to NAD 83 ? How do the horizontal datums differ? Which should I use ? What is …
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NAD83, Datums, and Geoid Models FAQ - Frontier Precision
https://frontierprecision.com/wp-content/uploads/nad83-datums-geoids_faq.pdf
WebA: When working with NAD27, that is a horizontal datum and not a vertical datum. You would be recommended to use Geoid 03 and check and/or calibrate vertically where …
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