Night Light of Upper Alton (Illinois) from space (United States) Src. Average luminocity for 10x10km area is 68.7687% and for 50x50km: 33.5911%.
Square area 10x10 km:
 16.33%
 17.86%
 9.35%
 4.42%
 14.8%
 11.39%
 4.93%
 8.5%
 11.39%
 1.02%
 0%Square area 50x50 km:
 6.57%
 7.59%
 5.05%
 4.1%
 5.7%
 5.37%
 3.62%
 3.46%
 5.76%
 6.3%
 46.48%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
39° 27' 23.2" North, 90° 51' 13.6" West
38° 54' 41.2" North, 90° 9' 2.4" West
38° 21' 44" North, 89° 26' 51.1" West
Some cities around Upper Alton sort by population:
• Alton
		3.7 km =2.3 mi, 
231°
• Spanish Lake
		14.9 km =9.3 mi, 
202°
• Old Jamestown
		14.4 km =8.9 mi, 
233°
• Godfrey
		5.8 km =3.6 mi, 
327°
• Wood River
		7.2 km =4.5 mi, 
140°
• Bethalto
		9.5 km =5.9 mi, 
91°
• Black Jack
		16.6 km =10.3 mi, 
217°
• East Alton
		4.9 km =3 mi, 
135°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016