Built sectors dedicated to economic activity in 2010 on Les Deux-Sèvres

This built area can also be described as an “urban task” or an urban envelope and is defined as the area delimiting a set of parcels built on a given date. This envelope is only a spatial reference for locating a boundary of construction according to different design criteria. However, that envelope does not in any way constitute the currently urbanised part defined by virtue of the application of land law, which is much more restricted, which is determined on the basis of factual elements of the ground and on the basis of jurisprudential criteria. This built sector serves only as a reference point to contribute to the assessment of the consumption of space in urban planning documents. Some specific features of the spatial distribution of built-up areas are observed in more detail. These differences can be attributed to the land structure of agricultural areas (cultural typology, parcel geometry, cultural methods of setting up farms, etc.), to land-based urbanisation patterns depending on the territory or, on the contrary, to more intensified forms of this residential development (e.g. regulatory aspect of urban planning documents). In the department, these different forms of urban envelopes are identifiable. For example, in the Deux-Sèvres, the periphery of Parthenay is composed of a scattered set of habitat represented by an urban envelope in cloud of dots. Whereas in contrast, Niort’s periphery is marked by larger but more concentrated envelopes. This data specifies the number of parcels that make up each urban envelope. This allows, by simple processing, to select only the corresponding urban envelopes, those consisting of at least four units.该建成区亦可被称为“城市任务”或城市包络线（urban envelope），其定义为划定一组于指定日期建成的地块（parcel）的区域范围。该包络线仅为依据不同设计准则确定建设边界的空间参考依据。 然而，该包络线绝不等同于依据土地法适用规则界定的当前已城市化区域——后者范围更为受限，其划定基于实地事实要素与法理准则。 该建成片区仅作为参考基准，用于辅助城市规划文件中的空间消耗评估。 针对建成区空间分布的若干具体特征，可开展更细致的观测分析。此类分布差异可归因于多类因素：农业区域的土地结构（如文化类型学特征、地块几何形态、农场布设的传统模式等）、依地域差异形成的土地依托型城市化模式，抑或是这类住宅开发的更高集约化形态（例如城市规划文件的规制要求层面）。 在法国省域范围内，可识别出这类不同形态的城市包络线（urban envelope）。例如在德塞夫勒省（Deux-Sèvres），帕尔特奈（Parthenay）的城郊区域由零散分布的聚居点构成，以点状云团状的城市包络线呈现；与之形成鲜明对比的是，尼奥尔（Niort）的城郊区域则以规模更大但布局更集中的包络线为典型特征。 本数据集明确了构成每条城市包络线（urban envelope）的地块（parcel）数量。通过简单的处理操作，即可筛选出仅由至少4个地块单元构成的对应城市包络线。