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What is my vertical datum

Question asked by m.cain on Mar 8, 2017
Latest reply on Mar 9, 2017 by m.cain

I have a feature class of Polygon ZM type, but without a vertical coordinate system specified, but a couple of elevation fields. Is there any way of telling whether the elevations in the fields are in NGVD29 or NAVD88 vertical datum?

 

I considered creating copies of the FC and defining the Z coordinate system for each as NGVD29 and NAVD88, then adding a new Z field, and calculating the "Max Z of geometry". Unfortunately both FCs yielded the same Z value (matching one of the pre-existing elevation fields).

Any thoughts?

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