Night Light of Cantanhede (Coimbra) from space (Portugal) Src. Average luminocity for 10x10km area is 20.7755% and for 50x50km: 23.7728%.
Square area 10x10 km:
 2.89%
 2.55%
 1.53%
 1.53%
 1.53%
 2.21%
 2.72%
 4.42%
 4.76%
 29.08%
 46.77%Square area 50x50 km:
 2.14%
 3.16%
 2.2%
 2.24%
 3.54%
 4.35%
 3.51%
 5.74%
 10.43%
 20.42%
 42.28%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
40° 52' 49.7" North, 9° 17' 50.4" West
40° 20' 48.2" North, 8° 35' 39.1" West
39° 48' 31.3" North, 7° 53' 27.9" West
Some cities around Cantanhede sort by population:
• Coimbra
		21.6 km =13.4 mi, 
136°
• Santo António dos Olivais
		21.5 km =13.4 mi, 
131°
• Santa Clara
		20.9 km =13 mi, 
141°
• Mira
		15.2 km =9.4 mi, 
306°
• Oiã
		22.3 km =13.9 mi, 
12°
• Arcos
		17.1 km =10.6 mi, 
48°
• Oliveira do Bairro
		20.5 km =12.7 mi, 
24°
• Arazede
		8.2 km =5.1 mi, 
215°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016