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LOADING A LOCALIZED GEOID

Click here to download Geoid 2012A for SurvPC.  A procedure used to update SurvPC with Carlson's Geoid 2012A.

GPS-ELEVATION

 

This is the best reference I have found explaining how GPS determines your elevation above sea level.  It explains the "reference ellipsoid" which is the surface GPS uses to determine elevation and the "reference geoid" which is a correction to determine elevation above sea level.


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