Night Light of Oulunsalo (Northern Ostrobothnia) from space (Finland) Src. Average luminocity for 10x10km area is 31.7949% and for 50x50km: 11.1492%.
Square area 10x10 km:
 3.85%
 6.96%
 4.4%
 5.68%
 2.2%
 2.01%
 3.48%
 9.07%
 11.81%
 15.93%
 34.62%Square area 50x50 km:
 3.07%
 2.67%
 0.95%
 1.1%
 1%
 0.7%
 0.56%
 1.14%
 2.72%
 6.06%
 80.04%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
65° 13' 50.8" North, 24° 42' 29.1" East
64° 56' 4.4" North, 25° 24' 40.4" East
64° 38' 6.1" North, 26° 6' 51.6" East
Some cities around Oulunsalo sort by population:
• Oulu
		9.1 km =5.7 mi, 
17°
• Haukipudas
		27 km =16.8 mi, 
354°
• Kempele
		5 km =3.1 mi, 
118°
• Kiiminki
		28.4 km =17.6 mi, 
39°
• Muhos
		30.9 km =19.2 mi, 
117°
• Liminka
		13.9 km =8.6 mi, 
179°
• Ii
		42.6 km =26.5 mi, 
357°
• Tyrnävä
		22.1 km =13.7 mi, 
148°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016