Canada - Gravity data compilation

The data used in this compilation come from the Canadian Gravity Database (CGDB), which is managed by the Canadian Geodetic Survey (CGS), Surveyor General Branch. CGDB includes more than 755 000 observations, including some 232 000 observations on land. The distribution of the land data represents an average of one gravity point per 40 km². The gravity maps, which are gridded to a 2-km interval with a blanking radius of 20 km, currently include data acquired between 1944 and 2015. CGS and partners continue to supplement the CGDB each year. The surveys are conducted using relative gravimeters that measure the gravity difference between two locations. On the landmass, gravity has been measured primarily using static gravimeters. Although measurements at some offshore locations have been collected using static gravimeters on the ocean floor, most are acquired using dynamic gravimeters aboard moving vessels. The relative nature of the gravimeters require that surveys be tied to base (control) stations with known absolute gravity. The base stations are part of the Canadian Gravity Standardization Network (CGSN), which is tied to the International Gravity Standardization Network 1971 (IGSN71). Today, the traditional base stations are being replaced by new base stations that are measured with an absolute gravimeter having an accuracy of 2µGal (2x10-8 m/s²). All relative gravity measurements are integrated into the IGSN71 datum to create a coherent dataset at the global scale. Normal (theoretical) gravity is calculated using the Geodetic Reference System 1980 (GRS80; https://doi.org/10.1007%2FS001900050278 ). Bouguer anomalies, which include reductions of the elevation and topographical mass to sea level, are calculated using a vertical gravity gradient of ~0.3086 mGal/m (change slightly with latitude and elevation) and a crustal density of 2670 kg/m³.

Date ( RI_367 ): 2010-09-10

Date ( RI_366 ): 2010-09-10

RI_415

Government of Canada; Natural Resources Canada; Surveyor General Branch - Canadian Geodetic Survey - Marc Véronneau ( Team Leader, Gravity & Height Systems )

588 Booth Street , Ottawa , Ontario , Canada

voice; 1 (343) 2926755
www.nrcan.gc.ca/maps-tools-publications/tools/geodetic-reference-systems/18766

RI_413

Government of Canada; Natural Resources Canada; Geological Survey of Canada - GSC Central Canada - Geophysics Data Center

601 Booth Street , Ottawa , Ontario , Canada

voice; 1 (613) 995-5326
http://gdr.agg.nrcan.gc.ca/gdrdap/dap/search-eng.php

RI_409

Government of Canada; Natural Resources Canada; Geological Survey of Canada - GSC Central Canada - Geophysics Data Center

601 Booth Street , Ottawa , Ontario , Canada

voice; 1 (613) 995-5326
http://gdr.agg.nrcan.gc.ca/gdrdap/dap/search-eng.php

RI_418

Government of Canada; Natural Resources Canada; Geological Survey of Canada - GSC Central Canada - Douglas Oneschuk ( Physical Scientist )

601 Booth Street , Ottawa , Ontario , Canada

voice; +1 (613) 947-3337
http://gdr.agg.nrcan.gc.ca/gdrdap/dap/search-eng.php

RI_414

Government of Canada; Natural Resources Canada; Geological Survey of Canada

Presentation form: tableDigital; tableNumérique RI_397

Name: Data

Purpose: These data are useful for geological interpretation and have applications in oil, gas, and mineral exploration. The gravity field is also used to define the geoid, which is the ideal shape of Earth, or mean sea level if Earth were completely covered with water.

Status: completed; complété RI_593

RI_412

Government of Canada; Natural Resources Canada; Geological Survey of Canada - GSC Central Canada - Geophysics Data Center

601 Booth Street , Ottawa , Ontario , Canada

voice; 1 (613) 995-5326
http://gdr.agg.nrcan.gc.ca/gdrdap/dap/search-eng.php

Maintenance and update frequency: asNeeded; auBesoin RI_540

GSC Keywords Vocabulary - Thesaurus Thésaurus - vocabulaire de mots-clé de la CGC ( RI_528 )

Geophysics
Geophysics, general

Government of Canada Core Subject Thesaurus Thésaurus des sujets de base du gouvernement du Canada ( RI_528 )

Earth sciences
Geophysics

Use limitation: No constraint

Use limitation: Open Government Licence - Canada (http://open.canada.ca/en/open-government-licence-canada)

Access constraints: license; licence RI_606

Use constraints: otherRestrictions; autresRestrictions RI_609

Spatial representation type: grid; grille RI_636

Distance: 200.00 http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources/uom/gmxUom.xml#metre

Metadata language: eng; CAN

Metadata language: fra; CAN

Character set: utf8; utf8 RI_458

Topic category

Geoscientific information

Description: Canada

Begin date: 1944-12-31

End date: 2017-09-27

Reference system identifier: http://www.epsg-registry.org/ / EPSG: 3978 / 6.14

Spatial representation info

No information provided.

Distribution format

GRD ( not applicable )

RI_412

Government of Canada; Natural Resources Canada; Geological Survey of Canada - GSC Central Canada - Geophysics Data Center

601 Booth Street , Ottawa , Ontario , Canada

voice; 1 (613) 995-5326
http://gdr.agg.nrcan.gc.ca/gdrdap/dap/search-eng.php

RI_414

Government of Canada; Natural Resources Canada; Geological Survey of Canada

Transfer size: 337

OnLine resource: Gravity anomalies, Canada (2 km grid) - English ( HTTP )
Dataset;ZIP;eng

OnLine resource: Gravity anomalies, Canada (2 km grid) - French ( HTTP )
Dataset;ZIP;fra

OnLine resource: Free air gravity anomalies, Canada (2 km grid) - English ( HTTP )
Dataset;ZIP;eng

OnLine resource: Free air gravity anomalies, Canada (2 km grid) - French ( HTTP )
Dataset;ZIP;fra

OnLine resource: First vertical derivative of gravity anomalies, Canada (2 km grid) - French ( HTTP )
Dataset;ZIP;fra

OnLine resource: First vertical derivative of gravity anomalies, Canada (2 km grid) - English ( HTTP )
Dataset;ZIP;eng

OnLine resource: Bouguer gravity anomalies, Canada (2 km grid) - French ( HTTP )
Dataset;ZIP;fra

OnLine resource: Bouguer gravity anomalies, Canada (2 km grid) - English ( HTTP )
Dataset;ZIP;eng

OnLine resource: Canadian Airborne Geophysical Database (CAGDB) Web service - French ( HTTP )
Web Service;WMS;fra

OnLine resource: Canadian Airborne Geophysical Database (CAGDB) Web service - English ( HTTP )
Web Service;WMS;eng

OnLine resource: Gravity anomaly map, Canada (Open File 8081) - English ( HTTPS )
Supporting Document;PDF;eng

OnLine resource: Gravity anomaly map, Canada (Open File 8081) - French ( HTTPS )
Supporting Document;PDF;fra

OnLine resource: First vertical derivative of gravity anomalies map, Canada (Open File 8080) - English ( HTTPS )
Supporting Document;PDF;eng

OnLine resource: First vertical derivative of gravity anomalies map, Canada (Open File 8080) - French ( HTTPS )
Supporting Document;PDF;fra

OnLine resource: Isostatic residual gravity anomaly map, Canada (Open File 8076) - English ( HTTPS )
Supporting Document;PDF;eng

OnLine resource: Isostatic residual gravity anomaly map, Canada (Open File 8076) - French ( HTTPS )
Supporting Document;PDF;fra

OnLine resource: Horizontal gradient of gravity anomalies map, Canada (Open File 8079) - French ( HTTPS )
Supporting Document;PDF;fra

OnLine resource: Horizontal gradient of gravity anomalies map, Canada (Open File 8079) - English ( HTTPS )
Supporting Document;PDF;eng

OnLine resource: Observed gravity map, Canada (Open File 8078) - English ( HTTPS )
Supporting Document;PDF;eng

OnLine resource: Observed gravity map, Canada (Open File 8078) - French ( HTTPS )
Supporting Document;PDF;fra

OnLine resource: Horizontal gradient of gravity anomalies, Canada (2 km grid) - English ( HTTP )
Dataset;ZIP;eng

OnLine resource: Horizontal gradient of gravity anomalies, Canada (2 km grid) - French ( HTTP )
Dataset;ZIP;fra

OnLine resource: Isostatic residual of gravity anomalies (2 km grid), Canada - English ( HTTP )
Dataset;ZIP;eng

OnLine resource: Isostatic residual of gravity anomalies (2 km grid), Canada - French ( HTTP )
Dataset;ZIP;fra

OnLine resource: Observed gravity, Canada (2 km grid) - English ( HTTP )
Dataset;ZIP;eng

OnLine resource: Observed gravity, Canada (2 km grid) - French ( HTTP )
Dataset;ZIP;fra

OnLine resource: Bouguer gravity anomalies description, Canada - French ( HTTPS )
Supporting Document;PDF;fra

OnLine resource: Bouguer gravity anomalies description, Canada - English ( HTTPS )
Supporting Document;PDF;eng

OnLine resource: First vertical derivative of gravity anomalies description, Canada - English ( HTTP )
Supporting Document;PDF;eng

OnLine resource: First vertical derivative of gravity anomalies description, Canada - French ( HTTP )
Supporting Document;PDF;fra

OnLine resource: Free air gravity anomalies description, Canada - English ( HTTP )
Supporting Document;PDF;eng

OnLine resource: Free air gravity anomalies description, Canada - French ( HTTP )
Supporting Document;PDF;fra

OnLine resource: Gravity anomalies description, Canada - English ( HTTP )
Supporting Document;PDF;eng

OnLine resource: Gravity anomalies description, Canada - French ( HTTP )
Supporting Document;PDF;fra

OnLine resource: Gravity point data file format and formulae description - French ( HTTP )
Supporting Document;PDF;fra

OnLine resource: Gravity point data file format and formulae description - English ( HTTP )
Supporting Document;PDF;eng

OnLine resource: Horizontal Gradient of Gravity Anomalies Description, Canada - French ( HTTP )
Supporting Document;PDF;fra

OnLine resource: Horizontal Gradient of Gravity Anomalies Description, Canada - English ( HTTP )
Supporting Document;PDF;eng

OnLine resource: Isostatic residual of gravity anomalies description, Canada - English ( HTTP )
Supporting Document;PDF;eng

OnLine resource: Isostatic residual of gravity anomalies description, Canada - French ( HTTP )
Supporting Document;PDF;fra

OnLine resource: Observed gravity description, Canada - English ( HTTP )
Supporting Document;PDF;eng

OnLine resource: Observed gravity description, Canada - French ( HTTP )
Supporting Document;PDF;fra

OnLine resource: Observed gravity description, Canada - English ( HTTP )
Dataset;WMS;eng

OnLine resource: Observed gravity description, Canada - French ( HTTP )
Dataset;WMS;fra

Hierarchy level: dataset; jeuDonnées RI_622

Statement: Compilation of data and grid generation

Description: 1) Generate grids from point data

2) Merge the grids together

3) Any additional (new) grids are merged into the original grid as needed.

4) Convert grids to HGD files, upload them to the DAP server and register them on the DAP

Date / Time: 2020-01-31T00:00:00.0

RI_416

Government of Canada; Natural Resources Canada; Geological Survey of Canada - GSC Central Canada - Douglas Oneschuk ( Physical Scientist )

Description: Canadian Gravity Database (CGDB)

File identifier: 5a4e46fe-3e52-57ce-9335-832b5e79fecc XML

Metadata language: eng; CAN

Character set: utf8; utf8 RI_458

Hierarchy level: dataset; jeuDonnées RI_622

Date stamp: 2020-04-27T13:03:23

Metadata standard name: North American Profile of ISO 19115:2003 - Geographic information - Metadata

Metadata standard version: CAN/CGSB-171.100-2009

RI_418

Government of Canada; Natural Resources Canada; Geological Survey of Canada - GSC Central Canada - Geophysics Data Center

601 Booth Street , Ottawa , Ontario , Canada

voice; 1 (613) 995-5326
http://gdr.agg.nrcan.gc.ca/gdrdap/dap/search-eng.php

RI_414

Government of Canada; Natural Resources Canada; Geological Survey of Canada

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