In the middle of a ModelBuilder tool I created, I have a Z enabled feature with multiple polygons. I want to add on a specific field of this feature, the lowest Z value of each polygon. I know this is easy to do using calculate geometry, but this option is not available on ModelBuilder and the "Add Z Information" tool is giving me error 00245 and the "Add surface information" is taking to long to process.
So I want to do this using a Python expression on the calculate field tool.
If this is possible, what expression can I use?