The reference rating corresponds to the altitude of the body of water modeled at the right of an existing project or construction.
It is displayed in m NGF-IGN 69, i.e. in meters in the official grading network in metropolitan France which is attached to the Marseille tide gauge.
The reference rating therefore does not correspond to a water height but rather to the altimetry of the water body.
The water height corresponds to the difference between the reference rating and the altimetry rating of the natural terrain.
__Origin__
A ZUS corresponds to an infra-communal district of;a city or agglomeration whose perimeter consists of road or street axes and cadastral plots.Each ZUS appears on a map using the SCAN25 which constitutes the only certified document of the ZUS perimeters. They are accompanied by a literal description street by street of the boundaries of the neighborhoods. The regulatory map at 1:25000 and the “street-by-street” description of the contours of the ZUS, can be downloaded from the ZUS http://i.ville.gouv.fr/divbib/doc/chercherZUS.htm.Le SG-CIV improves the location of ZUS perimeters using the geometry of the road network of the large-scale referential of l'IGN (BDTopo/BDAdresse). This better precision makes it possible to determine the addresses located in the ZUS. When the contours of the ZFU d' a single dataset use two different repositories, the field 'sourceGeometrie' is to be informed. The urban revitalisation zone ZRU is still geographically identical to the ZUS on which it superimposes itself.
__Partner organisations__
DDTM Vendée
__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-e672dd61-a35d-44c7-b691-9d4585f765cf)
* [COVADIS data standard: Sensitive urban area (including urban revitalisation area)(http://geostandards.developpement-durable.gouv.fr/afficherPageStandard.do?jeu=N_ZUS_ZINF)
[See this page on geo.data.gouv.fr](https://geo.data.gouv.fr/fr/datasets/5e532d89e5d679f46e278a65f626f46070563ebc)
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