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ARCMAP-ELLIPSOID - GEOID MODELS

Question asked by CADEngr2014 on Oct 16, 2016
Latest reply on Oct 19, 2016 by Dan_Patterson

Hello,

 

I have been reviewing the basics of coordinate systems and trying to understand the role behind the Ellipsoid and Geoid.  I understand that the height difference between the ellipsoid / geoid, and the height between earths topography / geoid are related (h=H+N).  However, in my research I understand that a total station can be set to give elevation values on the Ellipsoid or the Geoid.  So I have to ask:  if the ellipsoid is an ideal shape of the earth with a simplified mathematical model, and I can work on the Ellipsoid grid to get my coordinates / elevations, why introduce the geoid at all?

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