meets the predefined criteria. The process is repeated until
the entire flow is adequately described. The degree of pixel
similarity is defined by the Spectral Euclidean Distance
value (Haralick & Shapiro, 1985). Second, a Lee filter (Lee,
1980) was applied to the radar images to reduce the amount
of speckle and effectively preserve edges and features. A
pseudo-lava flow map was then produced by thresholding
the SAR amplitude imagery. Third, areas that were shown as
lava flows by both the Landsat-7 and radar imagery were
designated as lava flows. Based on vegetation and the lava