Night Light of Vialonga (Lisbon) from space (Portugal) Src. Average luminocity for 10x10km area is 68.1905% and for 50x50km: 45.9196%.
Square area 10x10 km:
 21.94%
 18.2%
 4.59%
 7.99%
 6.29%
 9.18%
 8.84%
 7.99%
 9.52%
 5.1%
 0.34%Square area 50x50 km:
 12.68%
 9.41%
 4.17%
 3.91%
 5.79%
 5.83%
 5.86%
 8.3%
 11.89%
 13.37%
 18.81%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
39° 25' 2.5" North, 9° 46' 52.2" West
38° 52' 19.4" North, 9° 4' 41" West
38° 19' 21.1" North, 8° 22' 29.7" West
Some cities around Vialonga sort by population:
• Póvoa de Santa Iria
		1.7 km =1.1 mi, 
136°
• Camarate
		8.8 km =5.5 mi, 
209°
• São João da Talha
		5.6 km =3.5 mi, 
197°
• Santa Iria da Azóia
		3.9 km =2.4 mi, 
207°
• Unhos
		6.9 km =4.3 mi, 
211°
• Bobadela
		7.4 km =4.6 mi, 
194°
• Alhandra
		8.6 km =5.3 mi, 
44°
• Apelação
		8 km =5 mi, 
215°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016