Dataset Direct Download Service (WFS): Area of hazard of a PPRN (PPRI de la Vée) in the department of Orne

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 assignment 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 to be subject to hazard (cases of breakage or inadequacy of the structure).The hazard zones may be classified as data compiled in so far as they result from a synthesis using several sources of calculated, modelled or observed hazard data. These source data are not covered by this class of objects but by another standard dealing with the knowledge of hazards.Some areas of the study perimeter are considered “zero 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).

本类区域指用于RPP风险分析的危险地图（hazard map）上标注的、受一种或多种危险影响的区域。该危险地图源于危险研究，其目标为评估研究区域内任意点位的各类危险强度。评估方法因危险类型而异，将在研究范围内划定若干区域，形成按危险等级分级的分区。针对区域内指定点位的危险等级赋值，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PPRN场景，危险地图上的每个分区通常会通过对应其所受危险的编码进行标识。危险地图上标注的所有危险区域均纳入本类范围。受防护结构保护的区域必须（可通过特定方式）予以标注，因即便存在防护结构，仍可能因结构破损或失效而面临危险。
危险分区可按已汇编数据进行分类，前提是这些分区源于对多源计算、建模或观测得到的危险数据的综合分析。此类源数据不属于本对象类别的覆盖范围，而是由另一项针对危险认知的标准进行规范。
研究范围内的部分区域被视为“零危险或可忽略危险分区（zero or insignificant hazard zones）”，即经研究确认无危险的区域。此类区域不属于本对象类别的覆盖范围，也无需作为危险分区进行标注。但针对天然RPP场景，监管分区可将未受危险影响的部分区域归类为规定区域（详见PPR类的定义）。