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With the ever-changing world of Adjustments, Datums and GEOIDS, there tends to be a lot of confusion as to what combinations should be used. Also we are often asked how these different settings and combinations affect our software’s calculations for our position. Using the wrong Datum and/or Geoid for your project can cause very poor results, and often leads to stress and lost time when trying to fix your data.

Linked below is an article written by David Zenk, National Geodetic Survey (NGS) Advisor. This material originally appeared in the Fall 2014 issue of the Minnesota Surveyor, a publication of the Minnesota Society of Professional Surveyors. All right reserved. 

“Correct Use of NAD 83 Realizations and GEOID Models”