Map Viewing Service (WMS) of the dataset: PPRI Seine (Argenteuil, Bezons)

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 PPRs, regulatory zoning may classify certain areas not exposed to hazard as a prescribing area (see the definition of the class “ZonePPR”).本类别的对象为：用于RPP风险分析的灾害地图（hazard map）上标注的、遭受一种或多种灾害（hazard）影响的区域。该灾害地图源于灾害专项研究，其目标为评估研究区域内任意点位处各类灾害的强度。不同灾害类型对应专属评估方法，据此可在研究区域范围内划定若干区域，形成按灾害等级分级的分区体系。对区域内某一给定点位的灾害等级进行赋值时，需综合考量该危险现象的发生概率及其强度等级。针对多随机PPRN场景，灾害地图上的每个分区通常会通过其受影响的各类灾害对应的编码进行标识。本对象类涵盖灾害地图上标注的全部灾害影响区域。受防护结构保护的区域也需予以标注（可采用特定标注方式），因为即便设有防护结构，仍可能因结构破损或防护不足而面临灾害威胁。此类灾害分区可作为经整合的数据进行分类，前提是其基于多源计算、建模或观测得到的灾害数据综合生成。上述源数据不属于本对象类的覆盖范围，而是由另一项针对灾害认知的标准进行规范。研究区域范围内存在部分被定义为“零灾害或微灾害区域”的点位：此类区域已完成灾害研究且灾害强度为零，因此不属于本对象类的覆盖范围，无需作为灾害分区进行标注。但针对自然PPR场景，监管分区体系可将部分未受灾害威胁的区域归类为规定区域（详见“ZonePPR”类的定义）。