Map Viewing Service (WMS) of the dataset: De Sangosse PPRT Hazard Zone 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 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.

本对象类对应用于RPP风险分析的灾害地图(hazard map)上标注的、暴露于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(study area)内任意点位处各类灾害的强度。评估方法因灾害类型而异，可在研究区域范围内划定若干区域，形成基于灾害等级的分级分区体系。对区域内特定点位的灾害等级赋值时，需综合考量该危险现象的发生概率及其强度等级。针对PPRT，灾害等级需依据影响类型在对应地图上确定，并在综合地图上形成总体聚合等级。灾害地图上标注的所有灾害区域均纳入本类范畴。受防护结构保护的区域亦需标注（可采用特定标注方式），因为即便设有防护结构，仍存在结构破损或效能不足的可能，此类区域仍被视为处于灾害风险之中。灾害区域可按经整合的数据进行分类，此类整合数据需基于计算、建模或观测得到的多源灾害数据合成而来。上述源数据不属于本对象类别的覆盖范畴，而是由另一项针对灾害认知的标准进行规范。研究区域范围内的部分区域被划为"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畴，无需作为灾害区域进行标注。