Night Light of Cascais (Lisbon) from space (Portugal) Src. Average luminocity for 10x10km area is 55.9847% and for 50x50km: 29.4781%.
Square area 10x10 km:
 21.77%
 18.37%
 2.04%
 2.38%
 1.7%
 3.4%
 0.85%
 6.8%
 16.33%
 19.22%
 7.14%Square area 50x50 km:
 10.34%
 7.1%
 2.39%
 2.7%
 3.55%
 2.9%
 3.06%
 3.32%
 3.57%
 5.07%
 56%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
39° 14' 36.5" North, 10° 7' 28.6" West
38° 41' 48.5" North, 9° 25' 17.3" West
38° 8' 45.4" North, 8° 43' 6.1" West
Some cities around Cascais sort by population:
• São Domingos de Rana
		7 km =4.3 mi, 
85°
• Oeiras
		9.6 km =6 mi, 
93°
• Alcabideche
		4.2 km =2.6 mi, 
14°
• Estoril
		2.3 km =1.4 mi, 
64°
• Monte Estoril
		1.7 km =1.1 mi, 
51°
• Carcavelos
		8.6 km =5.3 mi, 
94°
• Parede
		5.9 km =3.7 mi, 
94°
• Porto Salvo
		10.5 km =6.5 mi, 
74°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016