Round buildings become angular

[antifa-ev]

Are you aware of round buildings like storage tanks?
They become very ugly:

[antifa-ev]

@jharpster Any idea how to filter these buildings out? Either at your side or later at importing?

[nitrif]

Hi @antifa-ev , you are right that our polygonization algorithm performs really bad on round buildings. This is because we have made some design compromises that don't favor round edges.
But we are very interested in dropping poorly produced polygonization outputs. Think about how to compare output polygon with input pixel predictions in order to evaluate the polygonization quality, and drop only examples like this. We are open to suggestions.
Thanks.

[antifa-ev]

@nitrif I actually don't own the right PC to use machine learning (no GPU). But multiple angles > 90 °, of which this fake circle has 7, should be very uncommon at normal buildings. Or is this algorithm too simple to be considered?