Map Viewing Service (WMS) of the dataset: PPRI hazard zone downstream of Niort in Deux-Sèvres

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).暴露于RPP风险分析所用灾害地图（hazard map）中所标注的一种或多种灾害的区域。该灾害地图为灾害研究的成果，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。评估方法针对每种灾害类型量身定制，最终会在研究范围边界内划定若干区域，形成按灾害等级分级的分区方案。针对研究区域内指定点位的灾害等级赋值，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，各分区通常会在灾害地图上通过其所暴露的每种灾害对应的编码进行标识。本数据集涵盖灾害地图中标注的全部灾害区域。受防护结构保护的区域必须予以标注（可采用特定方式），因为即便有防护结构，仍可能因结构破损或防护不足而面临灾害风险。灾害分区可归类为经整合的数据集，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。此类源数据不属于本对象类别的覆盖范围，而是由另一项针对灾害认知的标准所规范。研究范围边界内的部分区域被视为“零灾害或微灾害区域”，即经研究确认无灾害风险的区域。此类区域不属于本对象类别的覆盖范围，无需作为灾害分区进行标注。但在天然RPP场景中，监管分区可能将未暴露于灾害的部分区域归类为规定区域（详见PPR类别定义）。