Digitalisation of the thermo-erosion gullies was accomplished using a Trimble differential GPS (model Pathfinder Pro XRS with a TSC1 data collector). Differential correction was applied on surveyed data using GPS Pathfinder Office v3.10 against Thule (Greenland) base station with 99% of data with an error less than 1 m. A Trimble R8 GNSS system replaced the DGPS in 2013. Geomorphological and erosion forms found in the gullies as well as the gullies contours were mapped and entered into the DGPS spatial database during 2009 and 2010 surveys. Overall, 44 gullies were mapped. Data was exported to ESRI's ArcGIS v10. Superposition of the spatial data with historical air photos (1958. 1961, 1972, 1982) and an IKONOS 2007, GeoEYE 2010 high resolution satellite imagery provide background layers to quantify the surveyed geodata. Visual representation of the gullies GIS provides quantitative and qualitative data about permafrost erosion resulting in thermo-erosion at large and small scale.
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APA Citation:
Thermo-erosion gully GIS in Valley of glacier C-79 on Bylot Island, Nunavut. (2014). [Data set]. Polar Data Catalogue. https://www.polardata.ca/pdcsearch/PDCSearchDOI.jsp?doi_id=10483