Saving money with a geoid model

• The geographic community needs orthometric heights, H

• Old way: H = H0 + DH (spirit leveling)

  • Time consuming, 4 person team. Expensive!

• New way: H = h - N (GPS & geoid)

  • Fast, accurate, 1 person team. Cheap!

• Part of NOAA’s “Height Modernization” program

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