Thanks to “Night cities”

Night Cities app

Once we know the city location, we need a geo-referencing process. This will allow us to link the identified photographs to a physical map. We currently have more than 1000 geo-referenced images layered on top of the Cities at Night Map:

Google engine

Unfortunately Google Maps Engine stopped working since January 2016 so the map is unavailable at the moment.


Below you can see examples of two maps made partly of black and white photographs (which is the real data used for the Black Marble Map) and partly of coloured photographs (the data from the ISS). Although this example is made in low resolution it is worthwhile to view these maps to obtain an idea of the potential that comes with having data available in colour instead of in black and white.

  • Nighttime image

  • Nighttime image

  • Spain