Building heights don't match actual measurements

[tifa365]

Thanks for this awesome data set and also putting a map together to explore it!

I've noticed that building height values seem to be inaccurate in several areas in Berlin. For example, Brandenburg Gate is in reality four times the height being listed (24 meters, not 8).

Is this a known limitation of the current methodology, or could there be an issue with the height estimation process? I think this could be checked by comparing against OSM data, which often includes building:levels or height tags for many structures, at least in well-mapped urban areas.