Dataset Direct Download Service (WFS): PPRMT Grisy-les-Plâtres (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).本对象类别涵盖用于RPP风险分析的灾害图（hazard map）上标注的、受一种或多种灾害影响的区域。该灾害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。不同灾害类型需采用专属评估方法，据此可在研究边界范围内划定若干区域，形成按灾害等级梯度划分的分区体系。针对研究区域内任意给定点位的灾害等级赋值，需综合考量危险现象的发生概率及其强度量级。针对多随机PPRNs场景，各分区通常会在灾害图上通过编码标识其对应的受影响灾害类型。本对象类别覆盖灾害图上标注的全部灾害区域。受防护结构保护的区域需予以标注（可采用专属标注方式），因即便设置防护结构，仍存在结构失效或防护不足的风险，此类区域始终被纳入灾害影响范畴。灾害分区可作为汇编数据进行分类，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。此类源数据不属于本对象类别的覆盖范围，而应由另一项针对灾害认知的标准规范进行管理。研究边界范围内的部分区域被归类为“零灾害或微灾害区域”，即经专项研究确认灾害强度为零的区域。此类区域不纳入本对象类别的覆盖范围，也无需作为灾害分区进行标注。但针对天然RPPs场景，监管分区可能将未受灾害影响的区域划定为规定区域（详见PPR类别的定义）。