Dataset Direct Download Service (WFS): Risks of the PPRi de la Loire, Val d’Orléans (Orlean city)

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中标注的、暴露于一种或多种灾害的区域。该灾害地图源于灾害专项研究，其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，最终会在研究范围内划定一系列区域，形成按灾害等级分级的区划。针对研究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。
针对多随机PPRNs场景，灾害地图上的每个区域通常会通过其暴露的各类灾害对应的编码进行标识。本数据集涵盖灾害地图上标注的全部灾害区域。防护结构保护的区域必须被表征（可采用特定方式），因为即便设有防护结构，仍需考虑其破损或失效时区域仍会遭受灾害影响的情况。
灾害区域可被视为衍生数据，其生成基于对多源计算、建模或观测得到的灾害数据的综合整合。此类源数据不属于本对象类别的范畴，而是由另一项针对灾害认知的标准进行规范。研究区域内的部分区域被视为“无灾害或灾害可忽略区域”，即经研究确认灾害风险为零的区域。此类区域不属于本对象类别范畴，也无需作为灾害区域进行表征。但针对天然RPP场景，监管区划可能会将部分未受灾害影响的区域划定为规定区域（详见PPR类别的定义）。