The origin of risk characterises the real-world entity which, by its presence, represents a potential risk. This origin can be characterised by a name and, in some cases, a geographical object l' real entity to #x27; origin of risk. The location of the entity and the knowledge of the hazardous phenomenon are used to define the risk basins, the areas exposed to the risks that form the PPR.In the PPRTs, it represents the \#x27; the enclosure of the facility(s) classified for the protection of the {\#x27; environment (ICPE) to the #x27 rd; origin of the risk analysed and processed by the PPR. In the PPRT methodology, it is described as a grey area
__Origin__
The perimeter of a prescribed PPR is usually provided in the prefect’s prescription order. The perimeter d' exposure to risks — or regulated perimeter — corresponds to the \#x27; geometric aggregation of l' all the restricted zones listed in the same PPR. The perimeter of the study corresponds to the envelope in which the hazards have been studied.
__Partner organisations__
DDTM Pas-de-Calais
__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-ec428d2b-39be-47d8-a15e-e31faf2e427c)
* [guidePPRT_V2.pdf](http://www.ineris.fr/centredoc/guidePPRT_V2.pdf)
[See this page on geo.data.gouv.fr](https://geo.data.gouv.fr/fr/datasets/1d854ffaae53b9a27dc2214cae5b63d69e453690)
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