Area exposed to one or more hazards shown on the hazard map used for PPR risk analysis. The map d'random is the result of the study of hazards whose goal is to evaluate the intensity of each hazard at any point in the zone of study. The evaluation method is specific to each type of hazard. It leads to the delimitation of a set of zones on the perimeter d'study constituting a graduated zoning according to the level of l'aira. L' Assignment of'A level of #x27;aira at a given point in the territory takes into account the probability of #x27; occurrence of the dangerous phenomenon and its degree of Â#x27; intensity.For multi-random PPRNs, each zone is usually spotted on the map d'a by a code for each hazard to which it is exposed. All hazard zones shown on the hazard map are included. Areas protected by protective works must be represented (possibly specifically) because they are always considered to be subject to the hazard (case of rupture or d' inadequacy of l’' structure). These source data are not covered by this class of objects but by another standard dealing with the knowledge of hazards.Some areas of the perimeter of #x27;study are considered as “zones of nil or insignificant hazard”. It is the areas where the hazard has been studied and is zero. These zones are not included in class d'objects and n'are not to be represented as zones d'aira. However, in the case of natural PPRs, regulatory zoning may classify certain areas not exposed to the hazard zone as a prescribing zone (see definition of class "ZonePPR").
__Origin__
The boundaries of a zone d’#x27;aira are represented on the map of hazards according to the level of l'random. In other words, polygon objects representing zones d'random form a partial coverage of the studied area of which each cover element is a closed polygon in which hazards have the same level of ' intensity. In other words, the criterion for cutting the zones d'random is the level of l'random.
__Partner organisations__
DDT Val-d'Oise
__Links annexes__
* [XML metadata view](http://ogc.geo-ide.developpement-durable.gouv.fr/csw/all-dataset?REQUEST=GetRecordById&SERVICE=CSW&VERSION=2.0.2&RESULTTYPE=results&elementSetName=full&TYPENAMES=gmd:MD_Metadata&OUTPUTSCHEMA=http://www.isotc211.org/2005/gmd&ID=fr-120066022-jdd-0ccec772-26f9-456f-b9ff-8b9c9675c3e3)
* [COVADIS data standard: Zone d'aira d'a PPRN](http://geostandards.developpement-durable.gouv.fr/afficherPageStandard.do?jeu=N_ZONE_ALEA_PPRN_AAAANNNN_S)
[See this page on geo.data.gouv.fr](https://geo.data.gouv.fr/fr/datasets/95ce1901f15250ca6859282f9f85ad308324d91a)
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