Dataset Direct Download Service (WFS): Risks of PPRT DPO in Semoy

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 PPRTs the hazard levels are determined by effect effect on maps by type of effect and overall on an aggregated level on a synthesis map.All hazard areas represented 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.

本数据集涵盖用于RPP风险分析（risk analysis）的灾害地图（hazard map）上标注的、受一种或多种灾害影响的区域。该灾害地图是灾害研究的成果，其核心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，会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方案。针对区域内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PPRTs，灾害等级按其影响效应确定：按效应类型分类绘制专项灾害地图，并在综合合成地图上展示整体聚合后的灾害等级。所有灾害地图上标注的灾害区域均纳入本数据集范围。受防护设施保护的区域也必须标注（可采用特定标注方式），因为即便有防护设施，仍存在结构破损或失效的可能，此类区域依然被视为受灾害影响的范围。灾害区域可依据其编制依据进行分类——此类区域均由多源计算、建模或观测得到的灾害数据综合整合而成。本数据集不涵盖上述源数据，源数据需遵循另一项针对灾害认知的标准进行规范。研究区域范围内部分区域被划为"零灾害或微灾害区域"：此类区域已完成灾害评估且灾害等级为零，因此不纳入本数据集的对象类范围，亦无需作为灾害区域进行标注。