Step 7: Conversion Surface

• Use Least Squares Collocation to combine:

  • ITRF96 / NAD 83 transformation
  • NAVD 88 bias (-52 cm)
  • Tilt (0.15 ppm, 327 azimuth)
  • Local GPS/Leveling/Geoid misfit

• G99SSS - Conversion Surface = GEOID99

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