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).本类对象指用于RPP风险分析的灾害分布图（hazard map）上所标注的、受一种或多种灾害影响的区域。灾害分布图是灾害研究的成果，其研究目标为评估研究区域内任意点位处各类灾害的强度。评估方法因灾害类型而异，可在研究范围内划定一系列区域，形成按灾害等级分级的分区方案。针对区域内特定点位的灾害等级进行赋值时，需综合考虑该危险现象的发生概率及其强度等级。 对于多随机PPRNs，灾害分布图上通常会通过代码标识每个区域所受的灾害类型。 所有在灾害分布图上展示的灾害区域均需纳入本数据集。受防护结构保护的区域也必须（可采用特定方式）标注出来，因为即便有防护结构，该区域仍存在受灾害影响的可能——例如防护结构发生破损或防护能力不足的情况。 灾害区域可被视为衍生数据，其来源于对多源计算、建模或观测所得灾害数据的综合整合。本类对象不涉及这些源数据，相关源数据由另一项专门针对灾害认知的标准进行规范。 研究区域内部分区域被视为"no or insignificant hazard zones"，即经研究确认不存在灾害的区域。此类区域无需纳入本类对象，也无需作为灾害区域进行标注。不过，对于天然RPPs，监管分区可能会将部分未受灾害影响的区域划定为规定区域（详见PPR类别的定义）。