Natural and anthropogenic cavities of very varied nature.Geographic information layer on underground cavities in Lower Normandy. The implantation of the information shows evidence of spot cavities. It distinguishes the different types of cavities known in the territory the former Basse-Normandie.
See technical instructions: http://www.donnees.normandie.developpement-durable.gouv.fr/pdf/CAVIT/Notice_CAVIT.pdf
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