The Nivellement Général de la France network was re-established by Charles Lallemand starting in the 1880s.
Notes on verification
Multiple independent sources (French Wikipedia, CTHS biographical database, Persée historical article, Henri Poincaré archive, regional history site) corroborate that Charles Lallemand organized and directed the Service du Nivellement Général de la France starting in 1884, succeeding the earlier Bourdalouë network. Minor variation exists regarding end dates of his tenure (1922-1928) but the core 1880s re-establishment claim is well-supported. [cascade flags: wikipedia_dropped_other_sources_exist | tier=bronze indep_score=0.525 clusters=5 claim_tier=notable | kind=empirical eligibility=high]
Sources
- Le nivellement - Géodésie (seed:geography_and_travel)
- https://www.persee.fr/doc/ingeo_0020-0093_1937_num_2_1_6311 (corroboration)
- https://cths.fr/an/savant.php?id=112601 (corroboration)
- https://www.aftopo.org/lexique/nivellement-lallemand-reseau-de/ (corroboration)
- https://henripoincare.fr/s/Correspondance/item/362 (corroboration)
- https://www.les-sorgues-vertes.com/204+le-nivellement-general-de-la-france-particularites-vauclusiennes.html?version=computer (corroboration)