 Coral reefs are in decline globally due to human activity, making it essential to monitor their health and status. Field surveys provide detailed information about individual reefs, but they are expensive and difficult to conduct frequently enough to track changes over time. Satellite imagery offers a more cost-effective way to monitor reefs, providing broad-scale data that can be used to identify trends and make informed decisions. The latest satellite imagery has improved greatly, allowing researchers to detect subtle changes in reef structure and composition. Additionally, new techniques have been developed to combine different types of data to create more comprehensive maps of reefs. These maps can help inform conservation efforts and provide valuable insights into how reefs respond to environmental stressors. This article was authored by John D. Hedley, Chris M. Ralph-Sema, Iliana Chollet and others.