i SE CE ? d 7 A 3 E 
Figure 5. Multi-temporal ERS-1 color composite showing the Pinatubo crater, 
Bucao and Santo Tomas Rivers, Mapanuepe Lake and the lahar- and 
flood-threatened towns of Botolan, San Marcelino and Castillejos on the 
west and the former US Clark Air Force Base, Angeles City and Sacobia- 
Bamban, Pasig-Potrero and Porac-Gumain Rivers on the east. 
Figure 6. Merged ERS-1/LANDSAT TM data showing enhanced relief features and 
built-up areas in San Marcelino and Castillejos, Zambales. 
444 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B7. Vienna 1996