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Thawing of ice-rich permafrost can lead to significant terrain modification, alter terrestrial and aquatic ecosystems, and pose a threat to infrastructure. This remote mapping project contributes data on the distribution and density of thaw slumps across several study regions: Peel Plateau, Bluenose Moraine, Tuktoyaktuk Coast, and Banks Island study areas(Segal et al, 2016).All active retrogressive thaw slumps in the study regions weredigitised on-screen by viewing georeferenced imagery in Google Earth, ESRI ArcMap (versions 10.0 and 10.1), and the NWT Spatial Data Warehouse Geospatial Portal (http://www.geomatics.gov.nt.ca/sdw.aspx, NWT Centre for Geomatics 2013; Latitude Geographics Group Ltd.). Slumps were mapped using SPOT 5 and SPOT 4 imagery (10-metre resolution). However, Quickbird imagery (0.6-metre resolution) was also available in some parts of the study area. The imagery dated from 2006-2008. For Mackenzie Valley regions orthophotos with an effective pixel size of 0.5m and capture date of 2004 were used. Slumps were identified based on the presence of exposed sediments, poorly developed vegetation, and a well-defined headwall. Identified slumps were then consolidated into a single shapefile using ArcMap. Waterbodies were removed from the study area using CanVec hydro features (waterbody products; 1:50000 resolution) (Government of Canada 2016) prior to the slump density calculations (Segal et al. 2016)Data from the four reports (see credits) were conbined into this single dataset by Caslys in March 2017. ", "geometryType": "esriGeometryPolygon", "sourceSpatialReference": { "wkid": 102002, "latestWkid": 102002 }, "copyrightText": "Segal, R.A., Lantz, T.C., and Kokelj, S.V. 2016. Inventory of active retrogressive thaw slumps in the Peel Plateau, Northwest Territories. Northwest Territories Geological Survey, NWT Open Report 2015-020, 7 pages.\nSegal, R.A., Lantz, T.C., and Kokelj, S.V. 2016. Inventory of active retrogressive thaw slumps on eastern Banks Island, Northwest Territories. Northwest Territories Geological Survey, NWT Open Report 2015-021, 8 pages.\nSegal, R.A., Lantz, T.C., Kokelj, S.V., Brietzke, C.K., Reichheld, S., and Martin, A.F. 2016. Inventory of retrogressive thaw slumps in the Tuktoyaktuk coastlands, western Anderson Plain, and Mackenzie Delta region, Northwest Territories. Northwest Territories Geological Survey, NWT Open Report 2015-022, 9 pages.\nSegal, R.A., Lantz, T.C., and Kokelj, S.V. 2016. Inventory of active retrogressive thaw slumps in the Bluenose Moraine, western Nunavut. 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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", "geometryType": "esriGeometryPolygon", "sourceSpatialReference": { "wkid": 102002, "latestWkid": 102002 }, "copyrightText": "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. 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