Dataset Direct Download Service (WFS): Hazard Areas of the Natural Risk Prevention Plan (PPRN) of Gousse — 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).

本类区域指用于风险防范计划（Risk Prevention Plan, RPP）风险分析的灾害分布图（hazard map）中标注的、受一种或多种灾害（hazard）影响的区域。该灾害分布图是灾害研究的成果，其研究目标为评估研究区域内任意点位处各类灾害的强度。评估方法因灾害类型而异，可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。对研究区域内指定点位进行灾害等级赋值时，需综合考量该危险现象的发生概率及其强度等级。

对于多随机PPRNs，每个区域通常会在灾害分布图上通过其所受灾害对应的编码进行标识。所有灾害分布图中展示的灾害影响区域均需纳入本类对象。受防护结构保护的区域也必须予以标注（可采用特定方式标注），因为即便有防护结构，该区域仍可能面临灾害风险（如结构破损或防护能力不足的情况）。灾害影响区域可被视为派生数据集，其数据来源为经计算、建模或观测得到的多源灾害数据的综合整合。本类对象不涉及这些源数据，相关源数据由另一项针对灾害认知的标准规范进行管理。

研究区域内部分区域被视为“无灾害或灾害影响可忽略的区域”，即经研究确认无灾害影响的区域。此类区域不纳入本类对象，也无需作为灾害影响区域进行标注。但对于自然类风险防范计划（RPP），监管区划可能将部分未受灾害影响的区域划定为规定区域（详见PPR类（PPR class）的定义）。