Dataset Direct Download Service (WFS): Natural Risk Prevention Plan (PPRN) hazard areas of Onard — 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).

本数据集对应风险预防计划（Risk Prevention Plan, RPP）风险分析所用灾害地图上标注的、受一种或多种灾害影响的区域。该灾害地图为灾害专项研究的成果，其核心目标为评估研究区域内任意点位各灾害的强度。评估方法因灾害类型而异，据此可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体系。在区域内给定点位分配灾害等级时，需综合考量该危险现象的发生概率及其强度等级。
针对多随机风险预防计划网络（PPRNs），灾害地图上的每个分区通常会通过其暴露的各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区域均需纳入本数据集范畴。防护结构覆盖的区域也必须予以标注（可采用特定标注方式），因为即便设有防护结构，仍可能因结构破损或失效而面临灾害风险。灾害区域可被视为加工后的数据集，其生成依托多源计算、建模或观测得到的灾害数据进行综合分析。此类源数据不属于本对象类别的管理范畴，而是由另一项针对灾害认知的专项标准进行规范。
研究区域内部分区域被划定为"无灾害或灾害可忽略区域"，即经专项研究确认无灾害发生的区域。此类区域不属于本对象类别，无需作为灾害区域进行标注。不过，针对自然风险预防计划（RPP），监管分区可将未受灾害影响的特定区域归类为规定区域（详见PPR类别的定义）。