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Description and comparison of surface features of geotechnical interest are facilitated by the application of optical diffraction analysis (ODA). “Before-and-after” pairs of photographs and series of photographs can be compared by image subtraction (IS), in which one image is subtracted from another similar image to produce a difference image. Optical correlation, in particular joint-transform correlation (JTC), can be used to compare the spatial information in pairs of photographs by a quantitative method yielding a correlation coefficient with values between 0 and 1. Comparisons of series of photographs can be accomplished by JTC by working with pairs of photographs in the series; the series may represent a sequence in time for the same area or a strip or mosaic in space of adjoining areas. Results are presented for IS applied to Landsat imagery of an area in Montana and for JTC applied to an area of the Union of Soviet Socialist Republics. IS is also applied to the optical transforms of an area in California photographed in visible light and in the infrared range.
remote sensing, image subtraction, joint-transform correlation, optical diffraction analysis, grid coding, terrain analysis
Postdoctoral project associate, The University of Wisconsin, Milwaukee, WI
Professor, University of Wisconsin, Milwaukee, WI