Night Light of Swansea (Wales) from space (United Kingdom) Src. Average luminocity for 10x10km area is 46.1644% and for 50x50km: 8.2337%.
Square area 10x10 km:
 10.43%
 11.5%
 2.67%
 3.48%
 6.82%
 5.88%
 4.41%
 5.75%
 19.65%
 21.52%
 7.89%Square area 50x50 km:
 0.93%
 1.23%
 0.68%
 1.12%
 1.18%
 1%
 1.07%
 1.12%
 2.91%
 7.43%
 81.34%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
52° 3' 18.9" North, 4° 38' 46.9" West
51° 37' 14.8" North, 3° 56' 35.6" West
51° 10' 55.7" North, 3° 14' 24.4" West
Some cities around Swansea sort by population:
• Llanelli
		16.5 km =10.3 mi, 
294°
• Neath
		10.7 km =6.6 mi, 
63°
• Briton Ferry
		8.7 km =5.4 mi, 
82°
• Ammanford
		19.4 km =12.1 mi, 
350°
• Gorseinon
		8.7 km =5.4 mi, 
308°
• Clydach
		7.6 km =4.7 mi, 
23°
• Pontarddulais
		12.3 km =7.6 mi, 
327°
• Cwmafan
		12.5 km =7.8 mi, 
92°
Sources (retrieved 2019-11-25):
» NASA, Earths city lights 1995
» NASA city lights 2003
» Earth at Night: Flat Maps 2012, 2016