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TitleSeasonal surface displacement derived from DInSAR, Rankin Inlet, Nunavut
AuthorShort, N; LeBlanc, A -M; Bellehumeur-Génier, O
SourceGeological Survey of Canada, Canadian Geoscience Map 291, 2016, 1 sheet,
PublisherNatural Resources Canada
Maps1 map
Map Info.surficial geology, sediment displacement, 1:35,000
ProjectionUniversal Transverse Mercator Projection, zone 15 (NAD83)
Mediaon-line; digital
File formatreadme
File formatpdf; rtf; shp; xml; jpg; xls
AreaRankin Inlet
Lat/Long WENS -92.4667 -92.0500 62.9000 62.7833
Subjectssurficial geology/geomorphology; engineering geology; displacement; sediment transport; glacial features; glacial deposits; Cenozoic; Quaternary
Illustrationsaerial photographs
ProgramLand-based Infrastructure, Climate Change Geoscience
Released2016 07 06
AbstractThis map shows the relative ground surface displacement between the major terrain units during one summer in the area of Rankin Inlet. The ground displacement was derived using differential interferometric synthetic aperture radar (DInSAR) data for the summer of 2015. DInSAR data came from the Canadian RADARSAT-2 satellite which operates with a C-band SAR. Stable ground represents locations where either no vertical change was calculated or where displacement was within the expected range of error (± 1.0 cm). Downward displacement represents, in general, ground surface lowering (subsidence) on the order of 1.0 to 2.5, 2.5 to 4.0, 4.0 to 6.0, 6.0 to 8.5, and 8.5 to 14.0 cm. Other possible causes of apparent downward displacement could be associated with downward surface water table movement throughout the summer and sediment erosion. Upward displacement represents a surface rise of 1.0 to 5 cm, which is only 0.3% of the total coverage of the DInSAR map. Areas of no data result from a loss of interferometric coherence. These are typically water and other relatively smooth surfaces from which there is no radar return, or where there has been significant ground surface disturbance and the radar returns cannot be correlated.
Summary(Plain Language Summary, not published)
This map shows the seasonal displacement of the ground derived from satellite interferometric radar, in the area of Rankin Inlet, Nunavut. The map shows the relationship between the surficial geology units and the stability of the terrain. The hamlet and the airport are examined in detail and the stabilizing effects of engineering strategies can be seen. The map provides guidance for infrastructure managers on areas that are less stable and may need remedial measures, and is a valuable tool in planning new infrastructure investment and construction.