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Pennsylvania/Williams and Stauffer
t :
g
(a) MSS band 5/19 July 1976 (b) MSS band 5/27 June 1977
(c) MSS-5 LANDSAT difference of 1976 to 1977
F
FIGURE 5.1. GEOMETRICALLY REGISTERED LANDSAT SUB-IMAGES SUBTRACTED TO YIELD
A DIFFERENCE IMAGE WHICH HIGHLIGHTS AREAS OF CHANGE. Note the light gray tone along
the ridge line in the upper right corner and center of the difference image (c). This light tone represents
forested areas with intact foliage in 1976 (a) and severely depleted foliage in 1977 (b) due to heavy feed-
ing by gypsy moth caterpillars.