Urban unit according to INSEE in Haut-Rhin

The concept of urban unity is based on the continuity of the building and the number of inhabitants. An urban unit is a municipality or group of municipalities with a continuous building area (no cut-off of more than 200 metres between two buildings) with at least 2,000 inhabitants. If the urban unit is located in a single municipality, it is referred to as an isolated city. If the urban unit extends over several municipalities, and each of these municipalities concentrates more than half of its population in the continuous built-up area, it is referred to as a multi-communal agglomeration.城镇连片性（urban unity）的概念以建筑连续性与居住人口规模为核心依据。城镇连片单元（urban unit）指拥有连续建成区（两栋建筑之间的间隔不超过200米）且常住人口不少于2000人的单个市镇或多个市镇的集合体。若该城镇连片单元仅隶属于单个市镇，则称之为孤立城镇（isolated city）。若该城镇连片单元跨越多个市镇，且每个所属市镇均将其半数以上的人口集中于该连续建成区内，则称之为多市镇连片集聚区（multi-communal agglomeration）。