The JRC has launched a new tool with data on all 10,000 urban centres scattered across the globe.
With data derived from the JRC's Global Human Settlement Layer (GHSL), researchers have discovered that the world has become even more urbanised than previously thought.
Populations in urban areas doubled in Africa and grew by 1.1 billion in Asia between 1990 and 2015.
Globally, more than 400 cities have a population between 1 and 5 million.
There are some promising signs for the environment: Cities became 25% greener between 2000 and 2015.
With every high density area of at least 50,000 inhabitants covered, the city centres database shows growth in population and built-up areas over the past 40 years.