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Layer: NTGS Slump Density Grid (ID: 8)

Name: NTGS Slump Density Grid

Display Field: TYPE

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: DESCIPTION: ESRI polygon type represents 15 x 15 km grid cells used to map retrogressive thaw slumps and data on relative slump density, based on NWT Open Report 2016-023 2.METHOD: Active retrogressive thaw slumps were mapped in a study area that included portions of the Yukon, Northwest Territories, and Nunavut, (study area of 1,274,625 km^2) using a 15 by 15 km grid system. GIS technicians assessed disturbance and landscape attributes for each grid cell by viewing georeferenced SPOT 5 and SPOT 4 orthomosaics from 2005-2010. Grid cells in the shape file have DENSITY attibute populated with values for 'mapped slump density' as follows: None, Low (1-5 slumps), Medium (6-14 slumps), High (15+ slumps), and NA(areas of water or bedrock terrain).ANALYSIS SUMMARY: Analysis was made at scales between 1:20 000 and 1:30 000, allowing mappers to confidently identify slumps as small as 0.75 ha. Stable slumps were not considered in this analysis because of challenges associated with consistently identifying stable, revegetated slump scars. As such, the mapping products derived using this methodology represent conservative estimates of slump distribution. A total of 615 grid cells, covering a total area of 138 365 km2 were identified as containing terrain influenced by thaw slumps. Most of the slump-affected grid cells (66%) were characterized as having a low density of active slumps, 24% by medium slump density and 10% by high slump density.PROJECTION: Canada Lambert Conformal Conic - reprojected from the original GNWT Lambert Conformal ConicATTRIBUTES:Shape_Leng - Perimeter of feature, in metres (Grid)Shape_Area - Area of feature, in metres squared (Grid)TYPE - The type of feature(Grid cell (15 x 15 km) for mapping retrogressive thaw slumps)DENSITY - Mapped slump density. None, Low (1-5 slumps), Medium (6-14 slumps), High (15+ slumps), NAREFERENCE - Reference to publication

Definition Expression: N/A

Copyright Text: Segal, R.A., Kokelj, S.V., Lantz, T.C., Pierce, K.L., Durkee, K., Gervais, S., Mahon, E., Snijders, M., Buysse, J., and Schwarz, S., 2016. Broad-scale mapping of terrain impacted by retrogressive thaw slumping in Northwestern Canada. Northwest Territories Geological Survey, NWT Open Report 2016-023, 17 p.

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