Provide three differences between NAD 27 and NAD 83? Provide three differences between NGVD 29 and...

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Civil Engineering

Provide three differences between NAD 27 and NAD 83?
Provide three differences between NGVD 29 and NAVD99?
Why was the change in datums needed?

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4.2 Ratings (634 Votes)

ADifferences between these two 1North American Datum 27 NAD 27 is based on Clarke Ellipsoid of 1866 which is calculated by manual surveying of the content whereas NAD 83 is based on the Geodetic Reference System GRS of 1980 GRS 1980 is the approximate measurement of the whole earth 2NAD 27 is based on the longitude and longitude and the direction between points NAD 83 is an earth centered datum which does not have beginning point or direction 3 The NAD 27 was calculated with a single survey point MEADES RANCH in Kansas as the datum point and the NAD 83 was calculated as a geocentric reference system with no datum point 4 NAD 27 and NAD 83 cannot support the 3D capability of the todays technology 5 NAD See Answer

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