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    • Guidelines for establishing GPS-derived ellipsoid heights [Standards: 2 cm and 5 cm]. Version 4.3. 

      Zilkoski, David B.; D'Onofrio, Joseph D.; Frakes, Stephen J. (NOAA NOS Center For Operational Oceanographic Products and Services Products and Services, Silver Spring, MD, 1997)
      The following guidelines were developed by the National Geodetic Survey (NGS) for performing Global Positioning System (GPS) surveys that are intended to achieve ellipsoid height network accuracies of 5 cm at the 95 percent ...