Map visualisation service (WMS) of the dataset: Plan for the prevention of natural hazards of landslides — Commune de Lafrançaise — Zone d’Aléas — Department of Tarn-et-Garonne.

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Dataset information

Country of origin
Updated
2022.09.09 00:00
Created
Available languages
French
Keywords
WMS 1.3.0, WMS 1.1.1
Quality scoring
195

Dataset description

Area exposed to one or more hazards shown on the hazard map used for the RPP risk analysis. The hazard map is the result of the study of hazards whose objective is to assess the intensity of each hazard at any point in the study area. The evaluation method is specific to each type of hazard. It leads to the delimitation of a set of zones on the study perimeter constituting a graduated zoning according to the level of the hazard. The award 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 works must be represented (possibly in a manner specific) because they are always considered subject to hazard (case of rupture or inadequacy of the work). Hazard zones may be described as elaborate data in so far as they result from a synthesis using several calculated hazard data sources, modelled or observed. These source data are not concerned by this class of objects but by another standard dealing with the knowledge of hazards. Some areas of the study perimeter are considered “zero or insignificant hazard areas”. These are the areas where the hazard has been studied and is zero. These areas are not included in the class of objects and do not have to be represented as hazard zones. However, in the case of natural PPRs, regulatory zoning may classify certain areas not exposed to hazard in prescribing zone (see definition of ZonePPR class).
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