The reference rating corresponds to the scale of the plan of water modelled at the right of a project or an existing construction. The reference rating therefore does not correspond to a height d'water but to the altimetry of the plane of water. The height corresponds to the difference between the reference rating and the altimetry rating of the natural terrain.
__Origin__
The GIS layers are produced by the offices of studies. They are then restructured and harmonised by the DDTM85.
__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-98748189-9da4-416b-9fc7-c8af4b55f01a)
* [complete approved file](http://www.vendee.gouv.fr/dossier-d-approbation-a2174.html)
[See this page on geo.data.gouv.fr](https://geo.data.gouv.fr/fr/datasets/93be912f7bd8ba28884b58db519ef816231c34d0)
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