Map Viewing Service (WMS) of the dataset: Natural Risk Prevention Plan (PPRN) hazard areas of the Grenada-sur-Adour and Larrivière-Saint-Savin — Landes sector (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).

本类对象指风险预防计划（Risk Prevention Plan, RPP）风险分析所用灾害分布图（hazard map）上标注的、受一种或多种灾害影响的区域。该灾害分布图为灾害研究的成果，其研究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分区。针对区域内特定点位的灾害等级赋值，会综合考虑该危险现象的发生概率及其强度等级。
针对多随机型风险预防计划（PPRNs），灾害分布图上的每个分区通常会通过代码标识其面临的各类灾害。所有标注于灾害分布图上的灾害区域均需纳入本类对象。受防护结构保护的区域亦需标注（可采用专属方式），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面临灾害风险。灾害分区可被视为经加工后的数据集，其依托多源计算、建模或观测得到的灾害数据综合生成。此类源数据不属于本类对象的范畴，而由另一项针对灾害认知的标准进行规范。
研究区域内部分区域被划分为"无灾害或灾害可忽略区域"，即经研究确认无灾害风险的区域。此类区域不属于本类对象范畴，无需作为灾害分区进行标注。但针对自然型风险预防计划（RPPs），监管分区可能将部分未受灾害影响的区域划定为规定区域（详见风险预防计划（PPR）类别的定义）。