Kernrechtsfrage
Whether a terrain alteration under Art. 18 BauG requires a topographical change or merely any change to the surface.
Extrahierter Entscheid
A terrain alteration does not require a topographical change; any modification of the surface qualifies, even if no level differences are created.
Extrahierte Begründung
Art. 18 BauG must be interpreted in the light of landscape and local heritage protection. It is systematically located in the chapter on heritage and landscape protection, whereas Art. 3(1)(c) BauG separately protects neighbors against substantial fill operations. The provisions therefore cover different interests and concepts.