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@wikipediaThe measurement of a straight line perpendicularly downwards from a reference point at surface.


Downward elevation of a given point with reference to the 
logging reference point:

TVDTVDSS + Logging

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Reference

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where Logging_Reference_Elevation is elevation measured along a straight line from sea level and usually selected as:

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Elevation


It is widely used in Subsurface Engineering.

See also

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Natural Science / Physics / Measuring / Positioning

Subsurface Engineering ] [ Altitude ]