Yeah, usually there are scripts that can update and import building outlines from open government data. Usually this is done with human guidance and by request.

Yeah, usually there are scripts that can update and import building outlines from open government data. Usually this is done with human guidance and by request. So if a mapper in a certain area notices missing or outdated building, he or she might request that someone in the community familiar with those import tools import the outlines for that area. Ideally the local mapper can then verify and enrich this data. In a lot of developed countries almost any building barring small garden sheds is meticulously described in government parcel databases with decimetre precision. In the past few years these outlines have been imported in the Netherlands in OpenStreetMap; it really looks a lot better than just a bunch of rectangles.