The Nivellement Général de la France network was established by Paul Adrien Bourdalouë between 1857 and 1864.
Notes on verification
Multiple independent French governmental, academic, and archival sources consistently confirm the 1857-1864 dates and Bourdalouë's role, with only a minor one-year discrepancy in a single English-language source. [cascade flags: wikipedia_dropped_other_sources_exist | tier=silver indep_score=0.838 clusters=4 claim_tier=notable | kind=empirical eligibility=high]
Sources
- Le nivellement - Géodésie (seed:geography_and_travel)
- https://www.aftopo.org/lexique/nivellement-bourdaloue-reseau-de/ (corroboration)
- https://www.persee.fr/doc/ingeo_0020-0093_1937_num_2_1_6311 (corroboration)
- https://francearchives.gouv.fr/fr/findingaid/c805f44e42fa197086642cbcd5dc79874301ea3b (corroboration)
- https://tourisme-marseille.com/fiche/les-plaques-reperes-de-nivellement-ngf-de-marseille/ (corroboration)