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I don't have a conclusive answer,but if all you have is a LIDAR point cloud and need to extract buildings out of it there's a few things you can try.Keeping in mind that both of these will find "bumps"...anything that stands out from the terrain,so buildings,trees,parked cars,garbage bins,anything.
Both methods are time consuming and will most likely yield results that need to be interpreted further.I'm trying to find trees in a LIDAR dataset and would be looking at area and circularity as criteria.
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