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Home > Geodetic System > Coordinate conversion > Height conversions > Converting between mean sea level datums

Converting Between Mean Sea Level Datums

This page describes how to convert normal-orthometric heights between MSL datums. The relationship between these heights is shown in the diagram below:

MSL Datum to MSL Datum Conversion.

The datum offsets can be used to transform heights between different normal-orthometric systems:

  • Determine the offset ( o1 ) for the "from" levelling datum
  • Determine the offset ( o2 ) for the "to" levelling datum
  • Use the following equation to convert the normal-orthometric height in MSL datum 1 ( H1 ) to MSL datum 2 ( H2 )
    MSL to MSL datum equation.

These equations have been implemented in the online coordinate conversion utility on this site. Instructions for carrying out online height conversions are also provided.

 
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