Presentation of magnetic anomaly map data by stereo projection of magnetic shadowgrams
Coloured magnetic maps published at the 1:1 000 000 scale by the Geological Survey of Canada have been found to be useful aids in support of regional geological mapping and compilation projects. However, because of the quantization into colour intervals, some of the fine detail contained in the orig...
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Language: | English |
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Canadian Science Publishing
1985
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Online Access: | http://dx.doi.org/10.1139/e85-030 http://www.nrcresearchpress.com/doi/pdf/10.1139/e85-030 |
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crcansciencepubl:10.1139/e85-030 2023-12-17T10:51:03+01:00 Presentation of magnetic anomaly map data by stereo projection of magnetic shadowgrams Broome, John Simard, Réjean Teskey, Dennis 1985 http://dx.doi.org/10.1139/e85-030 http://www.nrcresearchpress.com/doi/pdf/10.1139/e85-030 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 22, issue 2, page 311-314 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1985 crcansciencepubl https://doi.org/10.1139/e85-030 2023-11-19T13:38:38Z Coloured magnetic maps published at the 1:1 000 000 scale by the Geological Survey of Canada have been found to be useful aids in support of regional geological mapping and compilation projects. However, because of the quantization into colour intervals, some of the fine detail contained in the original magnetic data is lost. These smaller features can be brought out quite effectively with the shaded relief technique, although there is an attendant loss of amplitude information, which can be recovered by means of stereo-shadowgrams. A second shadowgram is produced by offsetting the original shadowgram by an amount proportional to the magnetic intensity of each data point and then the offset and original shadowgrams are viewed as a stereo pair. An example of the effectiveness of these techniques is the detail that can be seen on the shadowgrams and stereo-shadowgrams for the Lockhart River (IMW NP 12/13) and the Thelon River (IMW NQ 12/13/14) map sheets. Article in Journal/Newspaper Thelon River Canadian Science Publishing (via Crossref) Canada Lockhart ENVELOPE(-145.100,-145.100,-76.467,-76.467) Lockhart River ENVELOPE(-108.902,-108.902,62.802,62.802) Canadian Journal of Earth Sciences 22 2 311 314 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
General Earth and Planetary Sciences |
spellingShingle |
General Earth and Planetary Sciences Broome, John Simard, Réjean Teskey, Dennis Presentation of magnetic anomaly map data by stereo projection of magnetic shadowgrams |
topic_facet |
General Earth and Planetary Sciences |
description |
Coloured magnetic maps published at the 1:1 000 000 scale by the Geological Survey of Canada have been found to be useful aids in support of regional geological mapping and compilation projects. However, because of the quantization into colour intervals, some of the fine detail contained in the original magnetic data is lost. These smaller features can be brought out quite effectively with the shaded relief technique, although there is an attendant loss of amplitude information, which can be recovered by means of stereo-shadowgrams. A second shadowgram is produced by offsetting the original shadowgram by an amount proportional to the magnetic intensity of each data point and then the offset and original shadowgrams are viewed as a stereo pair. An example of the effectiveness of these techniques is the detail that can be seen on the shadowgrams and stereo-shadowgrams for the Lockhart River (IMW NP 12/13) and the Thelon River (IMW NQ 12/13/14) map sheets. |
format |
Article in Journal/Newspaper |
author |
Broome, John Simard, Réjean Teskey, Dennis |
author_facet |
Broome, John Simard, Réjean Teskey, Dennis |
author_sort |
Broome, John |
title |
Presentation of magnetic anomaly map data by stereo projection of magnetic shadowgrams |
title_short |
Presentation of magnetic anomaly map data by stereo projection of magnetic shadowgrams |
title_full |
Presentation of magnetic anomaly map data by stereo projection of magnetic shadowgrams |
title_fullStr |
Presentation of magnetic anomaly map data by stereo projection of magnetic shadowgrams |
title_full_unstemmed |
Presentation of magnetic anomaly map data by stereo projection of magnetic shadowgrams |
title_sort |
presentation of magnetic anomaly map data by stereo projection of magnetic shadowgrams |
publisher |
Canadian Science Publishing |
publishDate |
1985 |
url |
http://dx.doi.org/10.1139/e85-030 http://www.nrcresearchpress.com/doi/pdf/10.1139/e85-030 |
long_lat |
ENVELOPE(-145.100,-145.100,-76.467,-76.467) ENVELOPE(-108.902,-108.902,62.802,62.802) |
geographic |
Canada Lockhart Lockhart River |
geographic_facet |
Canada Lockhart Lockhart River |
genre |
Thelon River |
genre_facet |
Thelon River |
op_source |
Canadian Journal of Earth Sciences volume 22, issue 2, page 311-314 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e85-030 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
22 |
container_issue |
2 |
container_start_page |
311 |
op_container_end_page |
314 |
_version_ |
1785576209901420544 |