The origin of the NGF/IGN69 altitude system for metropolitan France was established from tide-gauge observations made at the Marseille Tide Gauge (Marégraphe de Marseille) between February 1, 1885 and January 1, 1897.
Sources
- Les réseaux de nivellement français - Géodésie (geodesie.ign.fr)
- https://tourisme-marseille.com/fiche/les-plaques-reperes-de-nivellement-ngf-de-marseille/ (tourisme-marseille.com)
- http://bdl.ahp-numerique.fr/focus-instruments-ac-maregraphe-marseille (bdl.ahp-numerique.fr)
- https://journals.openedition.org/ephaistos/8716?lang=en (journals.openedition.org)
- https://refmar.shom.fr/sites/default/files/fiches_data/GT_TSH_Fiche_referentiels_verticaux_Version_fevrier2024.pdf (refmar.shom.fr)
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