The concept of urban unity is based on the continuity of the building and the number of inhabitants. Urban unit is called a commune or a set of municipalities with a continuous built-up area (no cut of more than 200 meters between two buildings) that has at least 2,000 inhabitants.If the urban unit is located in a single municipality, it is called isolated city. If the urban unit s' extends over several municipalities, and each of these municipalities concentrates more than half of its population in the continuous built-up area, it is called a multi-municipal agglomeration.
__Origin__
A prescription is represented on the graphical documents of the PLU or POS. Its geometry is usually obtained by scanning the figures drawn on the regulatory zoning plane. The resulting geographical table must contain all the requirements identified as such in the urban planning document.
__Partner organisations__
DDTM Somme
__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-7530fd70-a64a-4f04-96a2-406fde44df5f)
* [COVADIS data standard: Linear Prescription of {\#x27;un PLU](http://geostandards.developpement-durable.gouv.fr/afficherPageStandard.do?jeu=N_PRESCRIPTION_LIN_ccccc)
[See this page on geo.data.gouv.fr](https://geo.data.gouv.fr/fr/datasets/9932cb66ef988c72b95aff50e7cc1207b24c4572)
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