Claudio Dupas
Figure 1: Single and fused image subsets comparison of an area with linear patches of gallery forest in the west of the
study area. Starting from the upper left: JERS-1 (a), TM 95 453 (b), ERS-2 (c), fused Brovey TM 95/JERS-1 (d), fused
Brovey TM95/ERS-2 (e), fused IHS cylindrical TM95/JERS-1 (f), fused IHS cylindrical TM95/ERS-2 (g).
on the image) for the hills that are facing away from the radar and layover (bright areas) for the hills facing towards the
radar. This effect is less pronounced for the JERS-1 since it has a medium incidence angle (35 degrees).
Figures 1f and 1d show the subset of the fused Landsat TM 95 / JERS-1 images resulted from the IHS cylindrical
transformation (TMJC) and from the Brovey transformation (TMJB) respectively. The distinction between forest and
non-forest is clearer on the TMJC (IHS cylindrical transformation) than in the TMJB (Brovey transformation) image,
giving to the first one an impression of greater sharpness. Figure 3-4 shows subsets of an area in the west of the study
area where gallery forests and pasture predominates. For the TMJB (Figure 3-4d) the patches of gallery forest have a
blurred appearance and their borderlines are difficult to identify. For the TMJC however, the bright reddish tone of the
forest greatly contrasts with the pasture's dark green.
The image subsets obtained from the fusion of the Landsat TM with the ERS-2 image are displayed in figures 1-e and
1-g. TMEC is the image resulted from the IHS cylindrical transformation and TMEB, the one resulted from the Brovey
transformation. The distinction made between the two fused TM / JERS-1 can also be applied to the fused Landsat TM /
100 International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part Bl. Amsterdam 2000.
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