At the World Bank headquarters in Washington, D.C., a new digital tool has just gone live that will let researchers, city planners, and disaster-response teams watch cities grow—in real time, every six months—from a vantage point 400 miles above Earth. The World Settlement Footprint Tracker, or WSF Tracker, launched this month, is a satellite monitoring system precise enough to spot individual buildings as they rise from the ground, tracking urban expansion across the entire globe with stunning clarity.
Cities and settlements occupy just 0.6% of Earth's land surface, yet they are home to more than 57% of humanity right now—and that proportion will swell to 68% by 2050. This concentration of people in small geographic patches makes the WSF Tracker's mission urgent: to understand not just where humans are building, but how fast they are building, and whether those new neighborhoods are rising in places vulnerable to flooding, earthquakes, subsidence, extreme heat, or cyclones.
The platform works by stitching together satellite data from the European Space Agency's Copernicus Sentinel missions, creating a 10-meter resolution view of every settlement on Earth from July 2016 through January 2026. Unlike older urban maps that offer only static snapshots at a handful of moments in time, the WSF Tracker updates every six months—meaning planners and researchers no longer have to wait years to see what has changed. The innovation lies in the combination of three things: the granular detail (10 meters is precise enough to see individual buildings), the frequency (every six months instead of every few years), and the speed (satellite data reaches users quickly after observation, not months or years later).
The tracker has already been put to work on the World Bank's own operations, according to Fabio Cian, ESA representative to the World Bank. "The combination of high spatial resolution, frequent updates and reduced lead time between observation and data availability makes the platform particularly relevant for operational and analytical applications," Cian said. He emphasized that the tool was designed with input from actual users—development partners, humanitarian organizations, city governments—to ensure it would solve real problems rather than sit unused.
The data tells an extraordinary story of urban change. In Goma, Democratic Republic of the Congo, the tracker reveals a decade of building activity, with the newest structures marked in bright yellow and older additions in deeper colors. New Cairo City, Egypt, shows a similar pattern of intensive development over the past ten years. These visualizations are not mere academic curiosities: they expose which neighborhoods are expanding fastest, which may be outpacing the infrastructure to support them, and which are rising in locations exposed to natural hazards.
The WSF Tracker emerges from a collaboration between the German Aerospace Center (DLR), the private firm MindEarth, the European Space Agency, and the World Bank—a partnership that Cian says demonstrates how space agencies, industry, and development institutions can jointly design solutions "that respond to operational needs, create public goods and support long-term institutional capacity." The platform is open-source, meaning researchers, governments, and nonprofits can access the data freely and build their own tools on top of it.
As cities continue their rapid expansion, having a clear, frequently updated picture of where and how that growth is happening may be one of the most practical tools for planning resilience in an uncertain future.