Marc, I think you might be thinking of SK53's work. I think he wrote several posts about how lidar can help identify buildings, e.g. here: http://sk53-osm.blogspot.be/2016/05/bristol-new-brighton-buildings-from.html
There is quite a bit of lidar altitude data available for Flanders, both raw and processed. The 3D GRB for example was based on that data. See: http://www.geopunt.be/catalogus/search?facet=catalog&q=lidar Building heights do have a wiki page: https://wiki.openstreetmap.org/wiki/Key:height#Height_of_buildings But then a rule of thumb is we don't map that which can easily be automatically generated, so I don't really see the point of using something like 3D GRB for OSM. An interesting thing about raw lidar data is that it can help identify trees, as they have a special kind of pattern in the data. So you could use processed data to identify potentially missing landuse=forest / tree rows / trees. -- Joost Schouppe
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