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= GIS Structures =

Three candidates are available for EDA : 
 * The French layer which is the most detailed : ["BDCarthage"] 
 * The european database from the JRC : ["CCM"] 
 * A database based on the previous one but less detailed : ["ECRINs"]

Projection : ETRS89-LAEA (srid=3035)

Another candidate : Réseau Hydrographique Théorique ["RHT"]


When comparing surface layers for ECRINs and CCM for the bassin Loire-Bretagne : the CCM layer is more extended than the Ecrin Layer

[[Image(source:eda/data/Docs/trac/Loire Bretagne 1 - CCM Ecrins.jpg,550px)]]

== Comparison table between CCM - Ecrins - BDCarthage ==

[[Image(source:eda/data/Docs/trac/Tableau Comparaison CCM-Ecrins-BDCarthage.jpg,750px)]]