The latest, complete version of the 3D BAG is available to use and download at http://3dbag.bk.tudelft.nl/ . It contains up-to-date data about the building heights and also on the quality of the height values, eg. are the values still valid, what is the geometric error of the 3d model.
You can read about it on the website or here: https://3d.bk.tudelft.nl/projects/3dbag/
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