For PPRTs, the code of l'environment defines a single category of zones for zones (L515-15 et seq.): areas exposed to risk. Unlike natural RPPs, PPRTs never have restricted areas that are not directly exposed to risks.
Depending on the level of d'aira, each zone of the PPRT is the subject of an opposable regulation. PPRT regulations generally distinguish two types of zones:
1- “zones d' prohibition to build”, so-called “red zones”, when the level of #x27; hazard is strong and the general rule is #x27; prohibition to build;
2- “prescription zones”, so-called “blue zones”, when the level of #x27; hazard is average and projects are subject to requirements adapted to the type of #x27; issue.
The instructions in the guide d' PPRT development add a gradation to the “red zones” and “blue zones”.
__Origin__
The geometric modeling of ' entity at ' origin of risk depends on the type of risk, the context of the PPR, the nature of the generator and its modeling in the data source or geographical repository from which it originates. For example, a water course may be represented by a polygon or a polyline according to its size and width, an ICPE by a point (if the location of its enclosure is not known) or by a polygon (especially from the grey area of the PPR).The geometry of this class d' objects is optional when: — this geometry is already carried by an object d'a geographical repository or d' an external data source, to which it is then recommended to refer to the ' help of its identifier (and thus avoid unnecessary duplication);- it does not exist because the origin of the risk cannot be precisely defined or localised (c' is the case of certain risks such as, for example, earthquakes, avalanches, sea submersions...)Nevertheless, as it is in practice rare to benefit from stable references to external objects, the geometry of l' origin of the risk will often result from the duplication of that of the #x27; object representing the #x27; origin of the risk.
__Partner organisations__
DDT Vosges, Office of Data Administration and Valorisation (BAVD)
__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-bae16018-fc16-47b1-b356-de7bc409f0dd)
* [map — Risks in the VOSGES Department](http://carto.geo-ide.application.developpement-durable.gouv.fr/340/risques.map)
[See this page on geo.data.gouv.fr](https://geo.data.gouv.fr/fr/datasets/458a2f448719a2a72e3b41c4373d49dc6b12add6)
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