Dataset Direct Download Service (WFS): Plan for the prevention of natural risks of terrain movement — Touffailles municipality — Zone d’aléa — Department of Tarn-et-Garonne

Area exposed to one or more hazards represented on the hazard map used for risk analysis of the RPP.
The hazard map is the result of the study of hazards, the objective of which is to assess the intensity of each hazard at any point in the study area. The evaluation method is specific to each hazard type. It leads to the delimitation of a set of areas on the study perimeter constituting a zoning graduated according to the level of the hazard. The allocation of a hazard level at a given point in the territory takes into account the probability of occurrence of the dangerous phenomenon and its degree of intensity.
For multi-random PPRNs, each zone is usually identified on the hazard map by a code for each hazard to which it is exposed.

All hazard areas shown on the hazard map are included. Areas protected by protective structures must be represented (possibly in a specific way) as they are always considered subject to hazard (case of breakage or inadequacy of the structure).
Hazard zones can be described as developed data to the extent that they result from a synthesis using multiple sources of calculated, modelled or observed hazard data. These source data are not concerned by this class of objects but by another standard dealing with the knowledge of hazards.
Some areas within the study area are considered “no or insignificant hazard zones”. These are the areas where the hazard has been studied and is nil. These areas are not included in the object class and do not have to be represented as hazard zones. However, in the case of natural RPPs, regulatory zoning may classify certain areas not exposed to hazard as prescribing areas (see definition of the PPR class).

本数据集涵盖用于RPP风险分析的灾害地图上标注的、遭受一种或多种灾害影响的区域。
灾害地图是灾害研究的成果，其核心目标为评估研究区域内任意点位的各类灾害强度。不同灾害类型对应专属的评估方法，据此可在研究范围内划定一系列区域，形成按灾害等级分级的区划体系。在研究区域内的特定点位分配灾害等级时，需综合考量危险现象的发生概率及其强度等级。

针对多随机PPRNs，灾害地图上的每个区域通常会通过其所暴露的各类灾害对应的专属编码进行标识。

灾害地图上标注的所有灾害区域均被纳入本数据集。受防护结构保护的区域也必须（可采用特定标注方式）进行标识，因为此类区域始终被视为处于灾害风险之中，例如结构发生破损或防护不足的情况。
当灾害区域由多源计算、建模或观测得到的灾害数据综合生成时，可将其作为已完善构建的数据进行描述。此类源数据不属于本对象类别的涵盖范围，而是由另一项聚焦灾害认知的标准进行规范。
研究区域内的部分区域被归类为"无灾害或灾害可忽略区域"，即经研究确认灾害风险为零的区域。此类区域不属于本对象类别的涵盖范围，也无需作为灾害区域进行标注。不过，对于天然RPP而言，监管区划可能将部分未受灾害影响的区域划定为管控区域（详见PPR类别的定义）。