Night Light of Zalla (Basque Country) from space (Spain) Src. Average luminocity for 10x10km area is 16.5955% and for 50x50km: 17.4844%.
Square area 10x10 km:
 0.45%
 1.67%
 1.82%
 1.82%
 2.12%
 2.42%
 3.64%
 2.12%
 4.39%
 16.97%
 62.58%Square area 50x50 km:
 2.94%
 3.29%
 1.63%
 1.76%
 2.25%
 2.59%
 2.17%
 2.84%
 4.96%
 10.7%
 64.85%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
43° 44' 36.4" North, 3° 50' 11.3" West
43° 13' 60" North, 3° 7' 60" West
42° 43' 8" North, 2° 25' 48.8" West
Some cities around Zalla sort by population:
• Barakaldo
		13.7 km =8.5 mi, 
59°
• Portugalete
		13.3 km =8.3 mi, 
43°
• Santurtzi
		13.4 km =8.3 mi, 
37°
• Sestao
		13.3 km =8.3 mi, 
50°
• Erandio
		15.2 km =9.4 mi, 
58°
• Zierbena
		13.6 km =8.5 mi, 
17°
• Ortuella
		10.7 km =6.6 mi, 
35°
• Güeñes
		3.9 km =2.4 mi, 
126°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016