Map Viewing Service (WMS) of the dataset: Natural Risk Prevention Plan (PPRN) hazard areas of Saint-Vincent-de-Paul — 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).本数据集的对象为用于风险预防计划（Risk Prevention Plan, 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。该灾害地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。不同灾害类型对应专属的评估方法，据此可在研究范围内划定若干区域，形成按灾害等级分级的分区区划。对研究区域内特定点位的灾害等级进行赋值时，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，通常会通过其暴露的各类灾害对应的编码，在灾害地图上标识每个分区。所有灾害地图上标注的灾害区域均需纳入本对象范畴。受防护设施保护的区域亦需标注（可采用专属方式），因为即便设有防护设施，仍存在设施破损或功能失效而导致灾害影响的可能。灾害分区可被视作衍生数据，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。此类源数据不属于本对象类别的范畴，而是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视作"无灾害或灾害影响可忽略区域"，即经专题研究确认灾害强度为零的区域。此类区域不属于本对象类别的范畴，亦无需作为灾害分区进行标注。但针对自然型风险预防计划（Risk Prevention Plan, RPP），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类别的定义）。