Dataset Direct Download Service (WFS): Plan for the prevention of natural risks of terrain movement — Commune of Brassac — Zone d’aléa — Department of Tarn-et-Garonne

Area exposed to one or more hazards represented on the hazard map used for risk analysis of the 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RPP风险分析的灾害地图中所标注的、暴露于一种或多种灾害的区域。
灾害地图是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的各类灾害强度。针对不同灾害类型，需采用专属评估方法，据此在研究范围内划定若干区域，形成按灾害等级分级的区划体系。对研究区域内某一具体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PPRN（multi-random PPRNs），通常会为每个暴露于灾害的区域，在灾害地图上标注对应各灾害类型的专属编码。
本数据集包含灾害地图上标注的全部灾害区域。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，仍存在结构破损或防护失效的可能，此类区域仍被视为处于灾害风险之中。
灾害区域可被视为经加工的数据集，其生成过程需整合多源的计算、建模或实测灾害数据。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归类为“无灾害或灾害可忽略区域”，即经专项研究确认灾害风险为零的区域。此类区域不属于本对象类别的范畴，亦无需作为灾害区域进行标注。但针对天然RPP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类别的定义）。