 The global human settlement layer, GHSL, project is developing new methods for mapping urban areas from satellite imagery. It uses Sentinel-2 data to provide more accurate and detailed information than previous methods, such as those based on Landsat data. Additionally, it can take advantage of the complementary capabilities of Sentinel-1 and Sentinel-2 satellites to improve the accuracy of its results. This article was authored by Martino Pezzarisi, Christina Corbane, Andrea Giulia, and others.