Name: NTGS Slumps

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Description: This dataset represents the spatial distribution of terrain affected by active retrogressive thaw slumping for portions of Northwest Territories and Nunavut. 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.

Copyright Text: 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. Segal, 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. Segal, 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. Segal, R.A., Lantz, T.C., and Kokelj, S.V. 2016. Inventory of active retrogressive thaw slumps in the Bluenose Moraine, western Nunavut. Northwest Territories Geological Survey, NWT Open Report 2015-023, 8 pages.

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