The Risk Prevention Plans (RPPs) were established by the law of 2 February 1995 on strengthening the protection of the environment. They constitute the essential instrument of the State in the field of risk prevention. Their objective is to control development in areas at major risk.
Risk Prevention Plans (RPPs) are approved by the prefects and generally carried out by the Departmental Directorates of Territories (DDT). These plans regulate land use or land use through construction bans or requirements on existing or future buildings (constructive provisions, vulnerability reduction work, restrictions on agricultural use or practices, etc.).
These plans may be in the process of being developed (prescribed), applied in advance or approved.The PPR file contains a submission note, a regulatory zoning plan and a regulation. Can be attached d' other graphic documents useful for understanding the approach (hazards, challenges...). Each PPR shall be identified by a polygon corresponding to the prescribing perimeter set of municipalities concerned when it is at the prescribed state; and l' envelope of restricted zones when it is at the approved state. Each existing PPRN document in the geographic table N_DOCUMENT_PPRN is linked to the N_DOCUMENT_PPRN;using its GASPAR code in the format “ddd[PREF|DDT|DDTM|DREAL]aaaaaannnn” (AAAA and NNNN correspond to the reference year and the number d' order of the PPR procedure associated in GASPAR):
1. to its administrative procedure; preparation (or revision) managed in the \#x27; GASPAR application, d' on the one hand,
2. its series of numerical constituent geographical data described by metadata sheet N_PPRN_AAAANNNN (#0001495) d' other.
__Origin__
The noise levels emitted by a given infrastructure during an average day are evaluated using numerical models producing isophone curves translated into noise zones, according to the; index recommended for all modes of transport at European level, namely the Lden index and l' index Ln.The isophone curves, described by the resource N_BRUIT_ISOPHONE_L thus serve to delimit the external borders and, where appropriate, internal noise zones by range of #x27; indices.
In Qgis, the MIZOGEO extension developed by CEREMA made it possible to aggregate the LNC zoning of the layers relative to the different types of roads.
__Partner organisations__
DDTM Pyrénées-Atlantiques
__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-87b76b60-5d64-44e7-adea-1d3cd9d921da)
* [COVADIS data standard: Table describing Noise Areas of (to be completed)(http://geostandards.developpement-durable.gouv.fr/afficherPageStandard.do?jeu=N_BRUIT_ZBR_INFRA_S)
[See this page on geo.data.gouv.fr](https://geo.data.gouv.fr/fr/datasets/3441ecc4d7aae57271cd1b896390c34c54acb45d)
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