The researchers used satellite images and mapping technology to study how the land in YongDeng County changed from 1993 to 2017. They found that over this time, there were significant changes in the types of land use, with more construction and less grassland. Urban growth, farming, and other activities caused these changes. For example, some grassland and woodland turned into buildings, while some cultivated land expanded. The study showed that cultivated land, transportation land, construction land, and water areas had the most noticeable changes. This information can help make decisions about how to manage the land in the future.