Night Light of Rio Tinto (Porto) from space (Portugal) Src. Average luminocity for 10x10km area is 97.8068% and for 50x50km: 53.4202%.
Square area 10x10 km:
 80.68%
 80.68% 12.01%
 12.01% 2.44%
 2.44% 2.76%
 2.76% 2.11%
 2.11% 0%
 0% 0%
 0% 0%
 0% 0%
 0% 0%
 0% 0%
 0%Square area 50x50 km:
 14.89%
 14.89% 11.81%
 11.81% 6.28%
 6.28% 8.42%
 8.42% 9.22%
 9.22% 6.08%
 6.08% 5.12%
 5.12% 4.75%
 4.75% 4.98%
 4.98% 6.22%
 6.22% 22.22%
 22.22%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
41° 42' 20.8" North, 9° 15' 45.6" West
41° 10' 43.4" North, 8° 33' 34.3" West
40° 38' 50.5" North, 7° 51' 23.1" West
Some cities around Rio Tinto sort by population:
• Ermesinde
		4.2 km =2.6 mi,  7°
7°
• Gondomar
		4.4 km =2.7 mi,  148°
148°
• Águas Santas
		3.8 km =2.4 mi,  338°
338°
• São Mamede de Infesta
		4.6 km =2.9 mi,  288°
288°
• Fânzeres
		2.8 km =1.7 mi,  116°
116°
• Valongo
		5.2 km =3.2 mi,  77°
77°
• Baguim do Monte
		2.1 km =1.3 mi,  46°
46°
• Pedrouços
		2.5 km =1.6 mi,  296°
296°
Sources (retrieved 2019-11-25):
» NASA, Earths city lights 1995
» NASA city lights 2003
» Earth at Night: Flat Maps 2012, 2016