MULTITEMPORAL CHANGE OF LAKE BRULLUS, EGYPT, FROM 1983 TO 1991

Change detection algorithms have been applied to MSS data for monitori ng changes inside and outside the Lake Brullus environment. Analysis o f the results reveals occurrence of erosion and accretion along both s ides of the lake inlet. During the study period (1983 to 1991), the la ke area decreased by an average rate of 8 . 6km(2) per year mainly due to drying for land reclamation. Comparison between standardized and u nstandardized principal components showed that the standardized PCs ar e more capable of identifying occurring changes. A simple technique, s uch as image differencing and ratioing, comprises a powerful method to emphasize changes, especially when we use thresholding.