• NGVD29 height (ftUS) to NGVD29 depth (ftUS)

  EPSG:7978
  Area of use: United States (USA)
  

• NAVD88 height (ftUS) to NAVD88 depth (ftUS)

  EPSG:7990
  Area of use: United States (USA)
  

• NAVD88 height to NAVD88 height (ftUS)

  EPSG:7988
  Area of use: United States (USA)
  

• MSL height to MSL height (ftUS)

  EPSG:8055
  Area of use: United States (USA) - onshore and offshore.
  

• MSL depth to MSL depth (ftUS)

  EPSG:8057
  Area of use: United States (USA) - onshore and offshore.
  

• NGVD29 height (ftUS) to NGVD29 height (m)

  EPSG:7972
  Area of use: United States (USA)
  

• Search valid (144)

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•    Vertical (6)
•    Compound (91)

• Operation (150)

•    Transformation (1)
•    Compound (3)
•    Conversion (146)

• Coordinate systems (5)

•    Vertical (2)
•    Cartesian (3)