Simple download service (Atom) of the dataset: PPRi hazard zone of the Loing Amont Valley (Department of Loiret)

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 allocation 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 subject to hazard (case of breakage or inadequacy of the structure). Hazard zones can be described as developed data to the extent that they result from a synthesis using multiple sources of calculated, modelled or observed hazard data. These source data are not concerned by this class of objects but by another standard dealing with the knowledge of hazards. Some areas within the study area are considered “no 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).本数据集指代用于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，且评估方法因灾害类型而异。研究最终会在研究范围内划定若干区域，形成按灾害等级分级的空间分区。为研究区域内某一特定点位赋值灾害等级时，需综合考量危险现象的发生概率及其强度等级。针对多随机PPRN，每个区域通常会通过其受影响的每种灾害的专属代码，在灾害地图上完成标识。灾害地图上标注的所有灾害区域均需纳入本对象范畴。受防护结构保护的区域亦须（可通过特定标注方式）予以体现，因为即便设有防护结构，此类区域仍存在灾害风险（如结构破损或防护效能不足的情形）。灾害分区可作为衍生数据进行描述，前提是其基于多源计算、建模或观测得到的灾害数据经综合分析生成。此类源数据不属于本对象类别的规范范畴，而是由另一项涉及灾害认知的标准进行管理。研究区域内的部分区域被划定为"无灾害或灾害影响可忽略区域"，即经专项研究确认灾害影响为零的区域。此类区域不属于本对象类别范畴，亦无需作为灾害分区进行标注。不过，针对天然RPP，监管分区可能会将未受灾害影响的区域列为规定区域（详见PPR类别的定义）。