The total French metropolitan leveling network spans approximately 300,000 km and includes approximately 330,000 markers in good condition.
Sources
- Les réseaux de nivellement français - Géodésie (geodesie.ign.fr)
- https://www.actu-alt-plus.com/tech-ia-futur/maregraphe-marseille-zero-altitudes-france/34196/ (actu-alt-plus.com)
- https://www.larousse.fr/archives/grande-encyclopedie/page/9633 (larousse.fr)
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