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Half-day ‘Mapping from Home’ virtual event: June 10, 2020
Abstracts and Presentations
National-scale flood risk assessment: GIS-based flood hazards exposure and vulnerability mapping at the census tract level across Canada
Liton Chakraborty, Andrea Minano, Jason Thistlethwaite, Daniel Scott, Daniel Henstra ; University of Waterloo / CAG-GIS
This study assesses social vulnerability to flood hazard exposure at the census tract (CT) level across Canada. Following the Cutter’s hazard-of-place model approach, geographical information system (GIS)-based bivariate choropleth maps reveal the hotspots of flood risk at the CT level. Flood exposure analysis captures the percent of residential properties in a CT exposed to any of the fluvial, pluvial, and coastal flood hazards at the 100-year flood recurrence interval.
The findings highlight the spatial patterns of social vulnerability to flood hazard, which critically helps policymakers identify geographic flood disadvantaged groups of communities in Canada.
Short Introduction to Creating Shaded Relief with Blender
Morgan Hite, Hesperus Arts, Smithers, BC / CCA
Although shaded relief for mountain ranges was originally hand drawn by artists, we now have tools for creating our own digital hillshades in software such as QGIS and ArcGIS. However, the free animation software Blender is another exciting tool for creating shaded relief.
Although designed to create animation sequences for film, Blender has a plugin (BlenderGIS) which allows the software to read a DEM, position light sources and shoot a single frame from overhead. Blender’s light-bounce algorithms, adjustable light-sources, and surface materials give delicious results, but the software initially appears quite intimidating.
I will demonstrate the basic method to produce hillshades in Blender, note the typical pitfalls, and the features a creative cartographer could go on to explore.
French Cartography West of Lake Superior in Relation to the Seven Years War
David Malaher, Centre for Rupert’s Land Studies, University of Winnipeg / ACMLA
Frontier skirmishes between the French and English colonies was brought on by competition for future living space. By the time La Verendrye was building his first large trading post on Lake of the Woods in 1732, a war with maps was underway. Claims for western land were made with maps, whether the geography was really known or not.
Policy at Le Dépôt de la Marine was weak in proving that France had a long history of occupying the region west of Lake Superior. The most significant map arising from the region west of Lake Superior in relation to the Seven Years War was produced by Auchagah and his Cree compatriots by 1730, 25 years before the War. From Auchagah’s map, J. N. Bellin in 1743 produced the first hydrologically correct map of the 500 km terrain immediately west of Lake Superior. French cartography west of Lake Superior played little or no part in starting or ending the Seven Years War.
Continue reading the full paper, published online in the ACMLA Bulletin Spring/Summer 2020