Night Light of Foz do Douro (Porto) from space (Portugal) Src. Average luminocity for 10x10km area is 71.3994% and for 50x50km: 42.2106%.
Square area 10x10 km:
 45.62%
 45.62% 15.42%
 15.42% 0.65%
 0.65% 0.49%
 0.49% 1.46%
 1.46% 0.16%
 0.16% 2.6%
 2.6% 8.93%
 8.93% 11.85%
 11.85% 8.93%
 8.93% 3.9%
 3.9%Square area 50x50 km:
 13.64%
 13.64% 9.7%
 9.7% 4.53%
 4.53% 5.53%
 5.53% 6.49%
 6.49% 4.21%
 4.21% 3.87%
 3.87% 3.5%
 3.5% 4.08%
 4.08% 4.8%
 4.8% 39.65%
 39.65%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
41° 40' 42.6" North, 9° 22' 27.7" West
41° 9' 4.3" North, 8° 40' 16.5" West
40° 37' 10.6" North, 7° 58' 5.2" West
Some cities around Foz do Douro sort by population:
• Porto
		5 km =3.1 mi,  91°
91°
• Vila Nova de Gaia
		5.8 km =3.6 mi,  121°
121°
• Senhora da Hora
		4.2 km =2.6 mi,  22°
22°
• Matosinhos
		3.7 km =2.3 mi,  336°
336°
• Canidelo
		3.7 km =2.3 mi,  146°
146°
• São Mamede de Infesta
		6.8 km =4.2 mi,  48°
48°
• Leça da Palmeira
		5 km =3.1 mi,  331°
331°
• Guifões
		5.2 km =3.2 mi,  2°
2°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016