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I am working on building foot print comparison. I would like to know the open data sets available to compare.

I found the OSM data from goefabrik: http://download.geofabrik.de/europe/germany/berlin.html

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    Can you specify which characteristics the datasets should have, especially in comparison to the OpenStreetMap data? – ojdo Aug 7 '16 at 17:25
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    @ojdo i did not define the characteristics yet, as i am exploring the open data set of only OSM through their /* This has been generated by the overpass-turbo wizard. The original search was: “building” */ [out:json][timeout:25]; // gather results ( // query part for: “building” node["building"]({{bbox}}); way["building"]({{bbox}}); relation["building"]({{bbox}}); ); // print results out body; >; out skel qt; in overpass-turbo.eu – Akarsh SEGGEMU Aug 7 '16 at 17:52
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For Berlin you can get data from the Berlin OpenData Portal: https://daten.berlin.de/

Here is the Dataset with the Buildings: https://daten.berlin.de/datensaetze/alkis-berlin-geb%C3%A4ude-wfs

At this moment the Link looks broken, but i found this WFS Service, which should contain the same data: http://fbinter.stadt-berlin.de/fb/berlin/service.jsp?id=s_wfs_alkis_bauwerkeflaechen@senstadt&type=WFS (WFS Capabilies: http://fbinter.stadt-berlin.de/fb/wfs/data/senstadt/s_wfs_alkis_bauwerkeflaechen?service=wfs&request=GetCapabilities)

If you compare to OpenStreetMap data, you should look if parts of the OSM-Data is imported from the official Data from the OpenData portal

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