Icings in the Great Slave region (1985-2014), Northwest Territories, mapped from Landsat Imagery / [by] P.D. Morse and S.A. Wolfe.: M183-2/7720E-PDF

Icings are sheet-like masses of layered ice that form over the winter by freezing of successive flows of water on the ground surface or on top of river or lake ice. Because icings can negatively impact the performance of seasonal and all-season roads, they are a transportation risk in the Arctic. Therefore, maps of their occurrence and reoccurrence provide important geoscience information required for development and transportation infrastructure planning. In this study, threshold values of band ratios were used to derive a set of icing maps from Landsat image time series of images (1985 - 2014), located within the Slave Geological Province (WRS-2 Path 47/Row 16). The icings maps were generated using image data acquired in late-spring when the region is largely snow-free, but ice bodies remain. A water mask created from summer image data was used to differentiate frozen water bodies so any remaining ice was considered to be land-fast, and thus icings formed from winter overland flow of water. Icing occurrence and reoccurrence maps were generated by overlaying the successive icing distribution maps in a Geographic Information System. This Open File contains digital, georeferenced icing data.

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