CGRG Bibliography of Canadian Geomorphology
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Author : Cerney, D.L.; and Butler, D.R.
Date : 2006.
Title : Multitemporal assessment of landscape change from oblique photographs.
Publication : 2006 Meeting of The Association of American Geographers, March 7-11 2006, Palmer House Hilton Hotel, Chicago, Illinois.
Issue :
Page(s) :
Abstract
Digital image processing of repeat photography was undertaken to assess landscape changes in the montane environment. Multitemporal color composites, principle components analysis and unsupervised training field classification were used to assess the changes recorded in photographs of the same landscape through time. Landscape change analysis was undertaken by means of processed registered dated images of Bellevue Hill, Horseshoe Basin and Lakevue Ridge in Waterton Lakes National Park, Canada. Contemporary landscape vegetation of the study area reflects distinct microclimatic and geomorphic conditions of the study area; permitting comparative analysis of the technique on different landscape conditions. Photographic pairs of various spatial scales, spanning time frames between 1914 and 2005 permit a robust analysis of the landscape characteristics. This technique permits greater certainty in the assessment of quality of data extracted from unique photographic pairs than traditional repeat photography. Images assessed by this technique clearly illustrate the locations of aspen and conifer canopy expansion, as well as canopy closure. The direction and timing of these migrations concur with other studies that tree establishment is most likely the product of "no-burn" policies and the synergistic effect of microclimates beneath tree canopies which promote seedling establishment and persistence.
Bibliography of Canadian Geomorphology