Dataset Direct Download Service (WFS): PPRMT Pontoise (Area area)

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).

本数据集涵盖用于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。该灾害地图源于灾害专项研究，其核心目标为评估研究区域内任意点位的各类灾害强度。不同灾害类型对应专属的评估方法，据此可在研究范围内划定一系列区域，形成按灾害等级分级的区划方案。针对某一特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，灾害地图上的每个区域通常会通过其暴露的各类灾害对应的编码进行标识，本数据集涵盖灾害地图上标注的全部灾害区域。受防护结构保护的区域也需被标注（可采用专属方式），因为即便设置了防护结构，仍存在结构破损或防护不足的风险，此类区域依旧被视为受灾害影响的区域。本类灾害区域数据可进行分类汇总，其源于对多源计算、建模或观测所得的灾害数据的综合整合。此类源数据不属于本对象类范畴，而是由另一项针对灾害认知的标准进行规范。研究范围内部分区域被视为“零灾害或微灾害区域”，即经研究确认无灾害影响的区域，此类区域不属于本对象类范畴，无需作为灾害区域进行标注。但针对天然RPP场景，监管区划可能将部分未受灾害影响的区域划为规定性区域（详见PPR类别的定义）。