Night Light of Oliveira do Bairro (Aveiro) from space (Portugal) Src. Average luminocity for 10x10km area is 50.4405% and for 50x50km: 23.6222%.
Square area 10x10 km:
 2.21%
 6.12%
 6.12%
 9.18%
 12.24%
 11.9%
 10.03%
 15.65%
 23.3%
 3.23%
 0%Square area 50x50 km:
 1.74%
 3.09%
 2.27%
 2.4%
 3.85%
 4.88%
 3.37%
 5.85%
 12.51%
 16.76%
 43.29%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
41° 2' 49.2" North, 9° 11' 49.2" West
40° 30' 52.6" North, 8° 29' 37.9" West
39° 58' 40.5" North, 7° 47' 26.7" West
Some cities around Oliveira do Bairro sort by population:
• Ílhavo
		17.8 km =11.1 mi, 
303°
• Esgueira
		18.8 km =11.7 mi, 
322°
• Águeda
		8.1 km =5 mi, 
30°
• Aradas
		17.2 km =10.7 mi, 
313°
• Oiã
		4.9 km =3 mi, 
309°
• Arcos
		8.6 km =5.3 mi, 
149°
• Eixo
		14.1 km =8.8 mi, 
333°
• Valongo
		11.9 km =7.4 mi, 
18°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016