Map Viewing Service (WMS) of the dataset: Perimeter of the PPRi de la Loire val d’Orléans (upstream)

This dataset contains the boundaries at the different stages of the development of the PPRN. The characteristic of these perimeters is to be the consequence of an official act and to produce their effects from a specified date. This is the following: — prescribed scope contained in the prescription order of a PPR (natural or technological); — scope of risk exposure that corresponds to the scope regulated by the approved RPP. This approved perimeter is a utility easement (PM1 for PPRNs and PM3 for PPRTs); — scope of study which corresponds to the envelope in which the hazards were studied.本数据集收录了PPRN（PPRN）发展各阶段的边界信息。此类边界的共性特征为：均由官方行政行为产生，并自指定生效日期起正式发挥效力。 具体包含以下三类边界： — 自然或技术型PPR（PPR）规定指令中载明的法定范围； — 与经批准的RPP（RPP）所规制的风险暴露范围相对应的风险暴露范畴；该经核准的边界属于公用役地范畴，其中PPRN对应PM1（PM1），PPRT（PPRT）对应PM3（PM3）； — 研究范畴，即开展危害研究时所覆盖的边界范围。