Its creator, Jurij Stare, has used data from the Earth Observation Group (EOG)
In different layers, interactively and using data from the NGDC Earth Observation Group (EOG) from 2013 to 2016 , Stare helps us understand the dimension of this type of pollution that generates a luminous cloud that does not allow us to see the stars.
Zaragoza at lightpollutionmap.info
You can find their map at lightpollutionmap.info. If when browsing the map you have doubts such as: why does Canada look like a Christmas tree? Jurij Stare answer in your section Doubts : “Two words: northern lights”. You can also access the information used here.
Santiago de Compostela at lightpollutionmap.info
Barcelona at lightpollutionmap.info
Madrid at lightpollutionmap.info