Dataset Direct Download Service (WFS): PPR Alea Zine Valone Flood

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).

本数据集涵盖的区域为用于RPP风险分析的灾害地图上标注的、受一种或多种灾害影响的区域。
灾害地图是灾害专项研究的成果，该研究的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若干区域，形成按灾害等级分级的分区体系。对研究区域内任一给定点位赋予灾害等级时，需综合考量该危险现象的发生概率及其强度程度。
针对多随机PPRNs，灾害地图上的每个分区通常会通过其受影响的各类灾害对应的专属编码进行标识。
灾害地图上标注的所有灾害影响区域均需纳入本数据集。受防护结构保护的区域也必须（可能需以特定方式）予以标注，因为此类区域始终被视为存在灾害风险——例如防护结构发生破损或防护能力不足的情况。
灾害分区可被视为衍生数据集，其来源于对多源计算、建模或观测得到的灾害数据的综合整合。本类数据集不涉及这些源数据，相关源数据由另一项针对灾害认知的专业标准进行规范。
研究区域内的部分区域被归类为"无灾害或灾害影响可忽略区域"，即经专项研究确认灾害风险为零的区域。此类区域不属于本数据集范畴，无需作为灾害分区进行标注。但针对天然RPPs，监管分区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类的定义）。