Dataset Direct Download Service (WFS): Hazard areas of the Oeyregave Natural Risk Prevention Plan (NRPP) — Landes (40)

Area exposed to one or more hazards represented on the hazard map used for risk analysis of the Risk Prevention Plan (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).

本类对象指用于风险预防计划（Risk Prevention Plan，RPP）风险分析的危险地图（hazard map）上标注的、受一种或多种危险影响的区域。危险地图是危险专项研究的成果，其核心目标为评估研究区域内任意点位的各类危险强度。评估方法因危险类型的不同而存在差异，最终将在研究范围内划定若干区域，形成按危险等级分级的空间分区。为研究区域内指定点位分配危险等级时，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，危险地图上的每个分区通常会通过其所对应的各类危险编码进行标识。危险地图上标注的所有危险区域均需纳入本类对象范畴。受防护结构保护的区域也必须予以标注（可采用特定标识方式），因为即便设有防护结构，该区域仍可能因结构破损或功能失效而处于危险情境中。危险分区可被视为经过开发的数据集，其成果来源于对计算、建模或观测获取的多源危险数据的综合整合。本类对象不涉及上述源数据，相关源数据的规范由另一项针对危险认知的标准予以规定。

研究区域内部分区域被划定为“无危险或危险可忽略区域”，即经专项研究确认危险等级为零的区域。此类区域无需纳入本类对象，也无需作为危险区域进行标注。但针对自然型RPP，监管分区可能将未受危险影响的区域归类为规定区域（详见PPR类的定义）。