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TitleCase study 8. Geological mapping derived from topography
DownloadDownload (whole publication)
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorMorris, W A; Ugalde, H; Slavinski, H; Markham, K
SourceRemote predictive mapping: an aid for northern mapping; by Harris, J R (ed.); Geological Survey of Canada, Open File 5643, 2008 p. 245-259; 1 DVD, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediadigital; on-line; DVD
RelatedThis publication is contained in Remote predictive mapping: an aid for northern mapping
File formatreadme
File formatpdf; ppt
Subjectsgeophysics; geophysical interpretations; magnetic surveys; aeromagnetic surveys; LANDSAT; topography; remote sensing; mapping techniques; computer mapping; radar imagery; lithology; geodesy; satellite geodesy; RADARSAT
Illustrationsimages; 3-D images; 3-D models; schematic representations
ProgramNorthern Mineral Development Program
Released2008 10 29
AbstractA geological boundary is outlined by topography when the two lithologies meeting at the contact have contrasting physico-chemical characteristics. The topographic response of the contact is related to the differential response of the various rock types to local weathering activities. Local climatic conditions may either accentuate or retard the erosion of rock types.
Derivation of topographic information comes from three types of surveys: distance ranging, stereogrammetry, and interferometry. For each of the three types of surveys, there are variations in the methods with which data are acquired. One of the most critical issues concerns the acquisition format. If isolated elevation points are acquired, then computation of a representative Digital Elevation Model (DEM) necessitates a gridding algorithm and care must be exercised to understand the impact of the gridding. In contrast, when a swath of elevation points is acquired, the quality of the DEM is defined by the pixel resolution of the acquisition instrument.
Examples of the use of topographic mapping of geology are given for a) flat-lying strata (Cypress Hills, Alberta); b) regional-scale folded strata (Whitefish Falls, Ontario), and c) highly deformed gneiss terrain (Grenville Province, Key Harbour, Ontario).

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