Upper Aa PPRN perimeter

This dataset contains the boundaries at the different stages of the PPRN; 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 defined date. It is: — prescribed perimeter set out in the prescribing order of n°#x27; a PPR (natural or technological); — perimeter d' exposure to risks that corresponds to the perimeter regulated by the approved PPR. This approved perimeter is a public utility easement (PM1 for PPRNs and PM3 for PPRTs); — perimeter d' study corresponding to #x27; envelope in which hazards have been studied. __Origin__ A hydraulic study carried out from 2012 onwards served as the basis for the definition of hazard. The hazard thus realised on a photogrammetric background dating from 2008 allowed, after crossing with the map of stakes, to determine the regulatory zoning. __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-acc4bab8-f2dc-441f-95a1-d2d0eb6701e6) * [Dynamic Mapping of the Var DDTM](http://carto.geo-ide.application.developpement-durable.gouv.fr/814/internet.map) [See this page on geo.data.gouv.fr](https://geo.data.gouv.fr/fr/datasets/a638954b222f88e973ad7412749eee6de7b130af)