 |
GEOPHYSICS - Regional and Detailed Images Help File |
Introduction
Methods
List of Geophysics Images
Disclaimer
Recommended Citation
References
Contact
INTRODUCTION
Geophysical images from provincial and federal surveys are available to view and
download from the Geoscience Atlas. They consist of regional aeromagnetic data
for all of Newfoundland and Labrador as well as more detailed surveys consisting
of predominantly aeromagnetic data but also gamma-ray and digital terrain
elevation data.
Information (e.g., survey logistics, link to survey report, link to digital
data) about individual surveys, except the Regional Residual Magnetic layers, can be obtained by clicking on the blue underlined NAME of the survey in the Contents
panel (e.g., Hopedale - 2018).
Alternatively, link to the same information by turning on the Index of Airborne
Geophysical Surveys and click on the polygon representing that survey. In the
Search Results window, click on the Links for the survey of interest and click
on the 'Airborne Survey' link to view general information about the survey, survey
logistics, and links to reports and digital data, if available.
Geophysical images can now be downloaded as tif, png and similar file types,
with associated registration files, in the UTM coordinate system, NAD27 datum.
METHODS
The REGIONAL
residual magnetic image layers for Newfoundland and for Labrador are accessed
at the very bottom of the Geophysics - Newfoundland and the Geophysics -
Labrador groups. They were flown by the
Geological Survey of Canada (GSC) from the early 1950s to the early 1980s
(Kilfoil, 1994).
These are the regional compilations of the shaded-relief airborne geophysical magnetic data, available for all
of Newfoundland and Labrador.
Processing steps for this "regional" data are described in Kilfoil, (1992,
1994). The data were flown at an 800 m line spacing. The images were
reprocessed and saved for the Atlas at a 20 m ground resolution.
The DETAILED geophysical surveys
are available above the Regional Residual Mag surveys in the Geophysics -
Newfoundland and Geophysics - Labrador groups at the bottom of the Atlas Contents
panel list. They were flown at line spacings ranging from 100m to 300m.
The images were processed and saved for the Atlas at a 10 m ground resolution.
The displayed images use false shaded relief, illuminated from the north.
The images cannot be queried in the Atlas, but can be downloaded in many formats including tif, jpg and png. The survey logistics are available by clicking on the help files for each image group (blue underlined text in the Contents
panel)
or by opening the Index of Airborne Geophysical Surveys and clicking on the polygon associated with that image. Note that the Regional
Residual Mag images are not available in the Index.
To top
LIST OF GEOPHYSICS IMAGES
Geophysics - Labrador
Mistastin Lake - 2012 (Residual Mag, Mag 1st Vert. Derivative)
Hopedale - 2018 (Mag Residual Total Field, Mag 1st Vert. Derivative, Mag 2nd Vert. Derivative, etc.)
Schefferville - 2009 (Residual Mag (merged), Mag 1st Vert. Derivative (merged))
Schefferville Centre - 2009 (Residual Mag, Mag 1st Vert. Derivative, Digital Terrain Model)
Schefferville West - 2009 (Residual Mag, Mag 1st Vert. Derivative, equiv. Uranium (gamma-ray) etc.)
Schefferville East - 2009 (Residual Mag, Mag 1st Vert. Derivative, equiv. Uranium (gamma-ray) etc.)
Shabogamo Lake - 2011 (Residual Mag, Mag 1st Vert. Derivative)
Regional Mag (Residual Mag - Labrador)
Geophysics - Newfoundland
Offshore Western Nfld - 2012 (Residual Mag, Mag 1st Vert. Derivative, Mag 2nd Vert. Derivative)
Gros Morne - 2009 (Mag Total Field, Residual Mag, Mag 1st Vert. Derivative, Mag 2nd Vert. Derivative, etc.)
Corner Brook - 2009 (Mag Total Field, Residual Mag, Mag 1st Vert. Derivative, Mag 2nd Vert. Derivative, etc.)
Deer Lake - 2009 (Mag Total Field Residual Mag, Mag 1st Vert. Derivative, Mag 2nd Vert. Derivative, etc.)
Indian Head - 2009 (Mag Total Field, Residual Mag, Mag 1st Vert. Derivative, Mag 2nd Vert. Derivative, etc.)
Baie Verte Peninsula - 2007 (Residual Mag, Mag 1st Vert. Derivative, Digital Terrain Model)
Gullbridge - 2007 (North: Residual Mag, Mag 1st Vert. Derivative; South: Residual Mag, Mag 1st Vert. Derivative)
Red Indian Line (compilation) - 2001 (Residual Mag Block J, GeoTEM - Block J, Residual Mag (merged), Mag 1st Vert. Derivative (merged))
Great Gull Lake (gamma-ray) - 1996 (Mag Total Field, Mag 1st Vert. Derivative, Potassium (gamma-ray), etc.)
Springdale - 1987 (Residual Mag, Mag 1st Vert. Gradient)
Twillick Brook - 2019 (Mag Residual Total Field, Mag 1st Vert. Derivative, Mag Horizontal Gradient, etc.)
St. Alban's - 2015 (Mag Residual Total Field, Mag 1st Vert. Derivative, VLF1 Total Field, etc.)
Compilation, North-Central Newfoundland (Mag Residual, Mag 1st Vert. Derivative, etc.)
Compilation, West-Central Newfoundland (Mag Residual, Mag 1st Vert. Derivative, equiv. Uranium, Radiometric Total Count etc.)
Regional Mag (Residual Mag - Newfoundland)
DISCLAIMER
Open File reports, maps and digital
data issued by the Geological Survey Division of the Newfoundland and Labrador Mining and Mineral Development Branch
are made available for public use. They have not been
formally edited or peer reviewed, and are based upon
preliminary data and evaluation. The user agrees not to provide a digital
reproduction or copy of this product to a third party. Derivative products
should acknowledge the source of the data.
The Geological Survey, a division of the Newfoundland and Labrador Mining
and Mineral Development Branch (the "authors and
publishers"), retains the sole right to the original data and information
found in any product produced. The authors and publishers assume no legal
liability or responsibility for any alterations, changes or misrepresentations
made by third parties with respect to these products or the original data.
Furthermore, the Geological Survey assumes no liability with respect to digital
reproductions or copies of original products or for derivative products made by
third parties. Please consult with the Geological Survey in order to ensure
originality and correctness of data and/or products.
RECOMMENDED CITATION
(for screen capture or download of image; also include reference to
original image survey from Index
information)
Newfoundland and Labrador Geological Survey. "image name." Newfoundland and Labrador GeoScience Atlas OnLine. Last
update: [check the What's New
file].
https://geoatlas.gov.nl.ca . [fill in date downloaded].
REFERENCES
Kilfoil, G.J., 2009.
Geophysical data from recent airborne surveys, Newfoundland and Labrador. In Current Research,
Edited by C.P.G. Pereira, and D.G. Walsh, Government of
Newfoundland and Labrador, Department of Natural Resources, Geological Survey
Branch, Report 09-01, pages 305-314. (
Geofile NFLD/3061)
Kilfoil, G.J. and Bruce, P.A., 1994.
A digital geophysical atlas:
implications for its design and construction. In Current Research,
Edited by C.P.G. Pereira, D.G. Walsh and R.F. Blackwood, Government of
Newfoundland and Labrador, Department of Mines and Energy, Geological Survey
Branch, Report 94-01, pages 301-311. (Geofile Nfld/2497)
CONTACT
Gerry Kilfoil
Project Geologist
Terrain Sciences and Data Management Section
Geological Survey Division, Mining and Mineral Development Branch
Government of Newfoundland and Labrador
P.O. Box 8700
St. John's, NL A1B 4J6
t. (709) 729-2168
Email: gerrykilfoil@gov.nl.ca
General
Email: GeoscienceOnline@gov.nl.ca
(Help File updated: April 2022)
(Database updated: check the What's New file)
To top