CGRG Bibliography of Canadian Geomorphology
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Author : Barnett, P.J.; Singhroy, V.H.; and Shirota, J.
Date : 2004.
Title : Use and misuse of digital elevation models in terrain analysis: examples from northwestern Ontario.
Publication : 49th Annual Meeting of the Geological Association and the Mineralogical Association of Canada. May 12-14, 2004. Brock University, St. Catharines, Ontario.
Issue :
Page(s) :
Abstract
Digital Elevation Models (DEMs) have become a commonly used tool in geology and in particular landscape analysis and visualization. It is a fundamental component of predictive mapping for engineering geology terrain investigations in the boreal forest regions of the Canadian Shield. The use of DEMs and their derivatives, combined or fused with Satellite imagery (Landsat TM and ETM, RADARSAT) provide a first approximation of terrain conditions in this setting. A by-product of the predictive process, the “Satellite Image Map”, is an extremely useful and visual product that displays terrain conditions. Major landforms and landform relationships can be observed and a better understanding of the glacial history of this vast region can be obtained. DEMs can also be misused or used beyond their limitations. The processes used in DEM construction can affect their uses. For example, drainage enforcement may not always produce a DEM true to the existing landscape. In addition, attempts to adjust DEMs to account for isostatic rebound are fraught with all nature of possible errors. When attempting this, extreme caution should be used and the limitations of the process and assumptions made, duly noted. The characteristics and advantages of DEMs highlighted above can mask errors and assumptions made when using and interpreting DEMs. Field data should be an integral part of DEM use and in their interpretation for geological purposes.
Bibliography of Canadian Geomorphology