Canada - Grid Spacing: 2km - Gravity - Bouguer

The Canadian Gravity Anomaly Data Base consists of approximately 660 000 gravity observations, including 165 000 on land, acquired between 1944 and the present. The data spacing ranges from less than 1 km to over 20 km, with an average spacing between 5 and 10 km. All measurements were reduced to the IGSN71 datum. Theoretical gravity values were calculated from the Geodetic Reference System 1967 (GRS67) gravity formula. Bouguer anomalies were calculated using a vertical gravity gradient of 0.3086 mGal·m-1 and a crustal density of 2 670 kg·m-3.

Data and Resources

Additional Info

Field	Value
Last Updated	April 17, 2026, 18:17 (UTC)
Created	April 17, 2026, 18:17 (UTC)
contact_email	infogdc@NRCan.gc.ca
contact_person	{"fr": "Gouvernement du Canada; Ressources naturelles Canada;Secteur des terres et des minéraux / Commission géologique du Canada / Centre,mathieu.ouellet@canada.ca", "en": "Government of Canada; Natural Resources Canada;Lands and Minerals Sector / Geological Survey of Canada / Central,1-613-992-6408,mathieu.ouellet@canada.ca"}
criticality_level	[]
data_dictionary	EPSG:3978,http://www.epsg-registry.org,8.7.4
geographic_scope	[]
open_canada_collection	fgp
open_canada_date_published	2010-09-10 00:00:00
open_canada_keywords	{"fr": ["levés gravimétriques", "Géophysique", "Sciences de la terre"], "en": ["gravity surveys", "Geophysics", "Earth sciences"]}
open_canada_subject	["form_descriptors", "nature_and_environment", "science_and_technology"]
sensitivity_level	unrestricted
title_fr	Canada - Espacement de la grille: 2km - Données gravimétriques aéroportées - Bouguer
update_frequency	unknown