# Land Surveyors United

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# HEIGHT DATUM

Good morning

This is Philos I'm surveyor, on my site we are using WGS84 Datum, can someone assist me how to calculate the height datum?

Regards

This Content Originally Published by a land surveyor to Land Surveyors United Network

Views: 344

### Replies to This Discussion

Dear Mr. Chams,

It is impossible to answer your question with particular certainty. In order to do so, one needs to know the location of your survey, the desired datum to which you wish to refer the height. It may further require knowing the appropriate geoid model.

WGS84 coordinates are 3-D. They may be expressed as X, Y, Z Cartesian coordinated from the center of mass of Earth or as Latitude, Longitude, and Ellipsoid Height. If it is elevation (orthometric height) you wish, then one must subtract the geoid height from the ellipsoid height to approximate the orthometric height (elevation).

That assumes you have proper 3-D WGS84 coordinates. Perhaps your horizontal position is good but the ellipsoid height is poor. In that case, the direct solution is to find a reliable benchmark and level from there to your points of interest.

JAC

yes anthony you are right

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