Perimeter of the plan for the prevention of natural hazards of Onnion (Haute-Savoie) — approved on 24/12/1996

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各开发阶段的边界信息。此类边界的共性特征为：均由官方行为设立，并自指定日期起产生法律效力。具体包含以下三类： —— PPR（天然或人工）审批指令中载明的法定适用范围； —— 与经核准RPP所规制范围一致的风险暴露范围；该核准边界属于公用设施地役权范畴（PPRN对应PM1，PPRT对应PM3）； —— 与隐患研究所涉空间包络相对应的研究范围。