How is the Advan Parent Placekey column different from the Shared Polygon Info?

I see that Advan provides a list of placekeys with shared polygons. I am curious to how exactly this differs from the parent placekey column already included in the monthly patterns. I had assumed that every placekey that has a non-null parent placekey would be considered a shared polygon, but it appears that this is not the case.

Shared some SafeGraph docs which should help. It sounds like Shared = the same polygon, Parent/Child = contained polygons.

Advan’s methodology for share polygons is different from the previous SafeGraph data.

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