 This study examined the expansion of cities in Portugal over a period of time, focusing on the municipalities of Sedgible and Sessembra. It used multispectral satellite imagery to classify land cover and monitor changes in urban land use. The study found that urban areas expanded significantly between 1990 and 2006, increasing by 91.11%. Additionally, the entropy value, which measures the degree of urban sprawl, increased from 0.73 in 1990 to nearly 0.90 in 2006. To project future land use changes, a cellular automata model was developed and validated against actual land use data. The model showed that urban land use will continue to increase at a rapid pace, potentially threatening areas designated as natural parks or agricultural lands. This article was authored by Yiccolo H. Araya and Pedro Cabral.