Dataset Direct Download Service (WFS): Zone d’aléa on the PPRT of the establishment Picoty/SDLP (Sté du Dépôt de La Pallice) in the municipality of La Rochelle in Charente-Maritime

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 PPRTs the hazard levels are determined effect by effect on maps by type of effect and overall on an aggregated level on a synthesis map. 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.用于RPP风险分析的危险图上标注的、暴露于一种或多种危险的区域。 危险图是危险研究的成果，该研究的目标为评估研究区域内任意点位的各类危险强度。针对不同危险类型，需采用专属的评估方法，由此在研究范围内划定若干区域，形成按危险等级分级的分区。对研究区域内指定点位分配危险等级时，需综合考量该危险现象的发生概率及其强度量级。 针对PPRT，危险等级需按效应类型在对应图件中逐效应判定，并在综合图上以聚合层级完成整体评定。 危险图上标注的所有危险区域均需纳入本类范畴。由防护结构保护的区域即便以特定方式标注，也必须纳入本类范畴，因为这类区域始终存在遭受危险的可能（例如防护结构发生破损或失效的情况）。 危险分区可被视为经加工完善的数据，其生成依托多源计算、建模或观测得到的危险数据的综合整合。本类对象不涵盖这类源数据，相关源数据应由另一项针对危险认知的标准进行规范。 研究区域内的部分区域被划分为"无危险或危险可忽略区域"，即经研究确认危险程度为零的区域。这类区域不属于本类对象范畴，也无需作为危险分区进行标注。