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TitlePredictive surficial geology, Washburn Lake area, Victoria Island, Nunavut, NTS 77-E and 77-F east
AuthorSharpe, D R; Lesemann, J -E; Parkinson, W; Armstrong, L; Dods, E
SourceGeological Survey of Canada, Canadian Geoscience Map 172, 2018, 2 sheets,
PublisherNatural Resources Canada
Maps2 maps
Map Info.surficial geology, remote predictive materials, 1:250,000
ProjectionLambert Conformal Conic Projection, UTM zone 13 (NAD83)
Mediadigital; on-line
RelatedThis publication is related to the following publications
File formatreadme
File formatpdf; rtf; xml; xls; shp
NTS77E; 77F/01; 77F/02; 77F/07; 77F/08; 77F/09; 77F/10; 77F/15; 77F/16
AreaVictoria Island; Washburn Lake
Lat/Long WENS-112.0000 -104.0000 71.0000 70.0000
Subjectssurficial geology/geomorphology; remote sensing; glacial deposits; landforms; terrain types; glacial landforms; vegetation; soil moisture; glacial features; eolian deposits; colluvial deposits; alluvial deposits; marine deposits; lacustrine deposits; glaciomarine deposits; glaciolacustrine deposits; glaciofluvial deposits; tills; remote predictive mapping; Cenozoic; Quaternary
ProgramRae Province Project Management, GEM2: Geo-mapping for Energy and Minerals
Released2018 06 04
AbstractThe predictive surficial geology map combines remotely predicted map and visually interpreted imagery from LANDSAT and SPOT data. Machine-automated classification was integrated with landform and regional ground-truth data. The tonal character of spectral data, moisture content, controlled by sediment texture, topographic position, vegetation, and material thickness is mapped by machine methods. Visual analysis of terrain form, with expert knowledge, reveals a series of crosscut streamlined flow fields that record a complex glacial history, including glaciolacustrine and marine limit water plains. Scoured bedrock in an east-west flow field indicates that it is an erosional terrain that bifurcates a high area of thick, ice-cored, hummocky terrain. Remotely predicted map methods are efficient, accurate, and save time in mapping spectral details on the ground surface, allowing the geologist more time in developing the essential geological models of glaciated terrain. This publication includes the predictive surficial geology data in two formats: Sheet 1, raster (~75%)/vector (~25%), and Sheet 2, vector.
Summary(Plain Language Summary, not published)
This 1: 250K surficial geology map of Washburn Lake, eastern Victoria Island, represents a new mapping method that integrates automated mapping of satellite imagery, and, traditional interpretive mapping by a geologist from imagery (air and satellite photographs). Satellite images record spectral tone or moisture variation used to classify terrain types. Automated classification is aided by training areas that incorporate terrain analysis used by photograph interpreters (geologist). These include mapping materials based on visual characteristics (mainly affecting moisture content), such as; tone, texture, size, shape, pattern, and other terrain features. The tonal character of moisture content, controlled by sediment texture, topographic position, vegetation, and material thickness, is most efficiently mapped by machine methods. Visual identification of landforms along with expert field-based knowledge reveal a widespread series of cross-cutting flow fields that record the complex glacial history of eastern Victoria Island, including ancient lake and marine limit water plains.