Protection zones for easements AC4 (Protection of architectural and urban heritage) in the Eure

The attitude of an easement is the spatial field (i.e., the geographical area) within which the easement applies. This space field can be defined either in 2D or in 3D in particular in the specific cases of airport clearance easements, easements to protect radio transmission centres.地役权（easement）的效力范围，指地役权适用的空间场域（即地理覆盖区域）。该空间场域可通过二维或三维方式予以界定，在机场净空地役权、无线电传输中心保护地役权等特定情形中，此界定方式尤为适用。