The researchers used satellite images to track changes in land use in Jinxi City, China. They classified different types of land, like forests and farmland, and monitored how they changed over time. They found that cultivated land, residential areas, and unused land changed the most. The images from the SPOT-5 satellite were more accurate than those from the ETM+ satellite, showing clearer details about the different types of land. This information is important for planning how to use land resources effectively.