Dataset Direct Download Service (WFS): PPRMT Argenteuil (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 PPRs, regulatory zoning may classify certain areas not exposed to hazard as a prescribing area (see the definition of the class “ZonePPR”).

本数据集指代用于RPP风险分析的灾害图（Hazard Map）中所标注的、遭受一种或多种灾害影响的区域。该灾害图为灾害专项研究的成果，其研究目标为评估研究区域内任意点位的各类灾害强度。评估方法因灾害类型而异，据此可在研究范围内划定若干区域，形成按灾害等级分级的区划。针对境内任意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（Multi-random PPRNs）场景，灾害图上的每个区域通常会通过其所受灾害对应的专属编码进行标识。本数据集包含灾害图中所有标注的灾害区域。受防护结构保护的区域必须予以标注（可采用特定方式），因为即便设置了防护结构，仍可能因结构破损或功能失效而面临灾害风险。灾害区域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别的覆盖范围，而归属于另一项针对灾害认知的标准规范。研究范围内的部分区域被视为“零灾害或微灾害区域”，即经专项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，无需作为灾害区域进行标注。但针对天然PPR（Natural PPR）场景，监管区划可能将未受灾害影响的部分区域划定为规定区域（详见“ZonePPR”类别的定义）。