Night Light of Cercedilla (Madrid) from space (Spain) Src. Average luminocity for 10x10km area is 19.8977% and for 50x50km: 16.058%.
Square area 10x10 km:
 0%
 2.11%
 1.79%
 1.3%
 6.82%
 3.73%
 1.62%
 2.6%
 8.77%
 25.97%
 45.29%Square area 50x50 km:
 1.53%
 2.71%
 1.62%
 2.38%
 2.53%
 1.63%
 2%
 2.84%
 5.28%
 12.47%
 65.01%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
41° 16' 17.8" North, 4° 45' 34.5" West
40° 44' 27.6" North, 4° 3' 23.2" West
40° 12' 22.1" North, 3° 21' 12" West
Some cities around Cercedilla sort by population:
• Collado-Villalba
		12.6 km =7.8 mi, 
159°
• Guadarrama
		8.1 km =5 mi, 
200°
• Alpedrete
		9.5 km =5.9 mi, 
163°
• Moralzarzal
		10.1 km =6.3 mi, 
134°
• Hoyo de Manzanares
		18.2 km =11.3 mi, 
136°
• Manzanares el Real
		16.4 km =10.2 mi, 
95°
• Collado Mediano
		6 km =3.7 mi, 
151°
• Boalo
		12.1 km =7.5 mi, 
103°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016