Simple download service (Atom) of the dataset: PPR Alea Zone Ligoure Flood

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).本数据集对象指用于RPP风险分析的灾害地图（Hazard Map）上标注的、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。针对不同灾害类型，需采用专属评估方法，由此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体系。在确定研究区域内指定点位的灾害等级时，需同时考量危险现象的发生概率及其强度量级。 针对多随机PPRN，每个区域通常会在灾害地图上通过对应其受影响的各类灾害的专属代码进行标识。 灾害地图上标注的所有灾害影响区域均需纳入本对象的覆盖范围。受防护结构保护的区域亦需（可采用特定标注方式）进行呈现，因这类区域始终存在受灾害影响的风险（如结构破损或防护效能不足的情况）。 灾害分区可被描述为经多源计算、建模或观测所得灾害数据综合整合后形成的数据集。上述源数据不属于本类对象的覆盖范围，相关管理由另一项聚焦灾害认知的标准规范负责。 研究区域内的部分区域被认定为"无灾害或灾害影响可忽略区域"，即经专项研究确认灾害风险为零的区域。这类区域不属于本对象类别的范畴，亦无需作为灾害分区进行标注。但针对天然RPP，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）。