The Nivellement Général de la France network was re-estab…

Science20th century (1962-1969)Francehigh confidence

The Nivellement Général de la France network was re-established by the IGN starting in 1962.

Notes on verification

Confirmed by IGN's own official site, corroborated independently by French Wikipedia, a CNIG technical PDF, and the AFT topography glossary. All sources agree on 1962-1969 timeframe.

Sources

Le nivellement - Géodésie (geodesie.ign.fr)
https://cnig.gouv.fr/IMG/documents_wordpress/2017/08/Lavoue_IGN_Evolution-Reference-Verticale-France.pdf (cnig.gouv.fr)
https://www.aftopo.org/lexique/nivellement-general-la-france-reseau-du/ (aftopo.org)

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