Map Viewing Service (WMS) of the dataset: Hazard Areas of the Natural Risk Prevention Plan (PPRN) of Dax — 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).本数据集指代用于风险预防计划（Risk Prevention Plan, RPP）风险分析的灾害地图（hazard map）中所标注的、遭受一种或多种灾害影响的区域。灾害地图是灾害研究的成果，其核心目标为评估研究区域内任意点位的各类灾害强度。不同灾害类型对应专属的评估方法，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区划。对境内某一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量级。 针对多随机风险预防计划（PPRNs），灾害地图上的每个区域通常会通过其所受灾害对应的专属编码进行标识。本数据集涵盖灾害地图上标注的全部灾害影响区域。受防护结构保护的区域也必须予以标注（可采用专属标注方式），因为即便设有防护结构，仍存在结构破损或防护不足的风险，此类区域依旧被视为处于灾害威胁之下。灾害区域可被归类为开发型数据集，其生成依托多源计算、建模或观测所得的灾害数据进行综合整合。此类源数据不属于本对象类别的管控范畴，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为“无灾害或灾害可忽略区域”，即经研究确认灾害影响为零的区域。此类区域不属于本对象类别范畴，无需作为灾害区域进行标注。但对于自然型风险预防计划（RPPs）而言，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）。