The house rings are taken from ALKIS’s database every six months. For this purpose, the ALKIS object types AX_Gebaeude, AX_Turm, AX_BauwerkOderAnlageFuerIndustrieUndGewerbe, AX_Holderspeicherbauwerk, AX_BauwerkOderAnlageFuerFreizeitUndRecovery, AX_OderRecovery or other equipment are evaluated and provided as 2D building envelopes. The database does not contain underground buildings. The objects have as attribute the AGS (8-digit municipal key). The data is provided free of charge via automated procedures or by self-collection. When using the data, the license conditions must be observed.
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