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datums
DM-51 - Vertical datums
Explain how a vertical datum is established
Differentiate between NAVD 29 and NAVD 88
Illustrate the difference between a vertical datum and a geoid
Illustrate the relationship among the concepts ellipsoidal (or geodetic) height, geoidal height, and orthometric elevation
Outline the historical development of vertical datums
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DM-51 - Vertical datums