GAEER: Global urban centre indicators of population ageing, heat exposure and healthcare access, 2000 to 2020

City-level indicators of population ageing, travel time to healthcare, and environmental exposure (summer land surface temperature, greenness, night-time lights) for 11422 urban centres worldwide, covering 2000, 2010, 2015, 2020. Boundaries follow the GHS Urban Centre Database R2024A. All indicators are computed by server-side spatial reduction over each urban centre boundary in Google Earth Engine and are derived entirely from openly licensed input products.