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Morphological interpretations of glacial forms by spatial analysis in the area surrounding lake Simcoe, Ontario / Victoria R. Balkwill Tweedie in Cartographica, vol 50 n° 3 (Fall 2015)  

Public [article]  inCartographica > vol 50 n° 3 (Fall 2015) . - pp 165 - 171 Titre : Morphological interpretations of glacial forms by spatial analysis in the area surrounding lake Simcoe, Ontario Type de document : Article/Communication Auteurs : Victoria R. Balkwill Tweedie, Auteur ; Alicja Jazwiec, Auteur ; Taylor P. Johnson, Auteur ; Isabella E. Vitale, Auteur Année de publication : 2015 Article en page(s) : pp 165 - 171 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Rédaction cartographique [Termes IGN] analyse comparative [Termes IGN] courbe de niveau [Termes IGN] drumlin [Termes IGN] modèle numérique [Termes IGN] modèle numérique de terrain [Termes IGN] Ontario (Canada) [Termes IGN] représentation cartographique Résumé : (Auteur) Drumlins are sedimentary geological features that indicate the final direction of glacier movement; as a result, they are of great interest in understanding past glacial events. In southern Ontario alone, thousands of drumlins have been mapped and interpreted remotely through the use of aerial imagery or topographic maps. These are often paired with digital elevation models (DEMs) and/or contour maps offering detailed information about the area of study. This paper presents the results of a change-detection study that used maps of different vintages of the drumlin-rich area around Lake Simcoe in southern Ontario. Two topographic maps and two DEMs, each with contours at 25-ft (7.6-m) and 10-m intervals, were compared in three regions: (A) the urban region in the city of Orillia, overlying sand plains; (B) the area east of Orillia, on top of clay plains; and (C) the region south-east of Lake Simcoe, overlying till plains. The 7.6-m contour topographic maps and DEMs display comparable levels of detail; however, over time the drumlins appear to erode, likely a product of the underlying sediment in combination with urbanization. The 10-m contour topographic maps display less detail than DEMs of the same resolution, suggesting that the popular topographic maps are not the most reliable method of mapping drumlins. Numéro de notice : A2015-565 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.3138/cart.50.3.3197B En ligne : http://www.utpjournals.press/doi/full/10.3138/cart.50.3.3197B Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=77728 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
031-2015031	RAB	Revue	Centre de documentation	En réserve L003	Disponible

SketchUp as a construction tool for large-scale subsurface structures: three-dimensional visualization of the Parry Sound Domain, Grenville Province, Ontario / Jacob W.D. Strong in Cartographica, vol 50 n° 3 (Fall 2015)  

Public [article]  inCartographica > vol 50 n° 3 (Fall 2015) . - pp 179 - 186 Titre : SketchUp as a construction tool for large-scale subsurface structures: three-dimensional visualization of the Parry Sound Domain, Grenville Province, Ontario Type de document : Article/Communication Auteurs : Jacob W.D. Strong, Auteur Année de publication : 2015 Article en page(s) : pp 179 - 186 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie numérique [Termes IGN] Canada [Termes IGN] carte gravimétrique [Termes IGN] champ de pesanteur local [Termes IGN] sous-sol [Termes IGN] structure géologique [Termes IGN] visualisation 3D [Termes IGN] visualisation cartographique Résumé : (Auteur) Three-dimensional visualization of subsurface geological boundaries can help researchers gain a better understanding of complex crustal structures in ancient orogenic belts such as the Grenville Province of Ontario, Canada. In this article, the geological structure of the Parry Sound Domain is visualized using SketchUp, with geological control from a regional gravity survey, Lithoprobe seismic transects line 30 and 31, and surface geological boundaries. The multilobed structure of the Parry Sound Domain is part of a tectonic outlier that lies on top of an orogenic thrust stack. Each of the three lobes exhibits a steeper-dipping west side to depth and a shallowly dipping east side to depth. Prior interpretations of the Parry Sound Domain's subsurface structure are modified on the grounds of a multi-disciplinary approach. Three-dimensional visualization of the Parry Sound Domain will improve the current understanding of the subsurface structure in the south-western Grenville Province. Numéro de notice : A2015-566 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.3138/cart.50.3.3197D En ligne : http://www.utpjournals.press/doi/full/10.3138/cart.50.3.3197D Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=77729 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
031-2015031	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Mapping the impacts of Iceland's Katla subglacial volcano on the Mýrdalsjökull glacier / Chelsi A. McNeill-Jewer in Cartographica, vol 50 n° 3 (Fall 2015)  

Public [article]  inCartographica > vol 50 n° 3 (Fall 2015) . - pp 195 - 203 Titre : Mapping the impacts of Iceland's Katla subglacial volcano on the Mýrdalsjökull glacier Type de document : Article/Communication Auteurs : Chelsi A. McNeill-Jewer, Auteur ; Jessica Vu, Auteur ; Lauren E. Oldfield, Auteur ; et al., Auteur Année de publication : 2015 Article en page(s) : pp 195 - 203 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie thématique [Termes IGN] cartographie des risques [Termes IGN] éruption volcanique [Termes IGN] géothermie [Termes IGN] glacier [Termes IGN] Islande [Termes IGN] point d'intérêt Résumé : (Auteur) Jökulhlaup is the Icelandic term for a sudden and substantial release of subglacial and/or proglacial water. The subglacial volcano Katla and its associated glacier Mýrdalsjökull, near Iceland's southern coast, have the potential to cause catastrophic jökulhlaups through geothermally induced melting and volcanic eruptions. The resulting jökulhlaups can cause destruction of property and detriment to human life. Water-filled ice depressions (termed ice cauldrons) are produced by enhanced geothermal heating/melting and are large enough to be identified through remote sensing; therefore, ice cauldrons can be used to infer geothermal hot-spot locations and melt rates. To assess the risk of surrounding communities and infrastructure, a map of geothermal hot spots, loss of glacial mass, and meltwater flow paths of the Mýrdalsjökull glacier were created and analysed. Using geospatial analysis, it was determined that three hazard zones – two towns, Alftaver (to the east) and Vik (to the south), as well as Iceland's main highway, Route 1 – are directly in the path of potential jökulhlaups originating from the Mýrdalsjökull-Katla complex. Future research should further constrain meltwater flow paths to determine potential flow discharge rates and areas that are at the greatest risk of flooding. Numéro de notice : A2015-567 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.3138/cart.50.3.3197F En ligne : http://www.utpjournals.press/doi/full/10.3138/cart.50.3.3197F Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=77730 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
031-2015031	RAB	Revue	Centre de documentation	En réserve L003	Disponible