Adding a shape vertex z value to a face attribute

Hi, I have a question some of you might be able to answer.

I have a large set of building footprints. The footprint do not got a height attribute in itself. Each vertice in the face do have a z value that indicates its height above 0 (water). Is there a way to add the z value of a vertice inside a footprint feature to attributes on the footprint ? That way I could add use that height and subtract the value of the underlying terrain to find the height of the building.

The z value of each vertice do vary to some degree, but I only need access to one of them.

I have added some files if you need to experiment. There is one elevation file, and a file containing the a building shape file and the underlying terrain:

Hope some of you can answer.


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