Night Light of San Ildefonso (Castille and León) from space (Spain) Src. Average luminocity for 10x10km area is 8.6429% and for 50x50km: 8.3973%.
Square area 10x10 km:
 0.34%
 2.04%
 0.34%
 2.04%
 0.68%
 0.68%
 0%
 1.87%
 0.34%
 10.37%
 81.29%Square area 50x50 km:
 0.42%
 1.24%
 0.9%
 1.17%
 1.41%
 1.03%
 0.96%
 1.27%
 2.24%
 7.5%
 81.87%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
41° 25' 52.1" North, 4° 42' 35.9" West
40° 54' 6.6" North, 4° 0' 24.7" West
40° 22' 5.7" North, 3° 18' 13.4" West
Some cities around San Ildefonso sort by population:
• Segovia
		10.7 km =6.6 mi, 
298°
• Guadarrama
		26.4 km =16.4 mi, 
195°
• Moralzarzal
		25.1 km =15.6 mi, 
173°
• Cercedilla
		18.4 km =11.4 mi, 
193°
• Manzanares el Real
		23 km =14.3 mi, 
148°
• Collado Mediano
		23.2 km =14.4 mi, 
183°
• Miraflores de la Sierra
		22.7 km =14.1 mi, 
115°
• Boalo
		22 km =13.7 mi, 
159°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016