Night Light of Walnut Creek (California) from space (United States) Src. Average luminocity for 10x10km area is 58.5097% and for 50x50km: 40.0611%.
Square area 10x10 km:
 7.63%
 7.47%
 3.73%
 6.98%
 16.72%
 20.94%
 14.77%
 10.39%
 11.36%
 0%
 0%Square area 50x50 km:
 7.84%
 7.3%
 2.29%
 4.93%
 6.39%
 7.95%
 6.79%
 5.62%
 12.98%
 15.74%
 22.17%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
38° 27' 32.4" North, 122° 46' 5.1" West
37° 54' 22.7" North, 122° 3' 53.9" West
37° 20' 58" North, 121° 21' 42.6" West
Some cities around Walnut Creek sort by population:
• Concord
		8.5 km =5.3 mi, 
20°
• Pleasant Hill
		4.6 km =2.9 mi, 
4°
• Lafayette
		5.2 km =3.2 mi, 
243°
• Moraga
		9.8 km =6.1 mi, 
215°
• Alamo
		6.9 km =4.3 mi, 
155°
• Waldon
		2.4 km =1.5 mi, 
20°
• Contra Costa Centre
		2.4 km =1.5 mi, 
14°
• Saranap
		2.6 km =1.6 mi, 
202°
Sources (retrieved 2019-11-25):
» NASA, Earths city lights 1995
» NASA city lights 2003
» Earth at Night: Flat Maps 2012, 2016