Night Light of Sélestat (Grand Est) from space (France) Src. Average luminocity for 10x10km area is 29.0387% and for 50x50km: 11.3961%.
Square area 10x10 km:
 5.36%
 7.89%
 2.23%
 1.79%
 3.27%
 1.64%
 1.34%
 2.98%
 3.57%
 40.92%
 29.02%Square area 50x50 km:
 1.42%
 1.83%
 0.95%
 1.24%
 1.25%
 1.04%
 1.24%
 1.46%
 3.34%
 10.53%
 75.71%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
48° 43' 40.4" North, 6° 44' 44.8" East
48° 15' 43" North, 7° 26' 56" East
47° 47' 30.2" North, 8° 9' 7.3" East
Some cities around Sélestat sort by population:
• Colmar
		21.3 km =13.2 mi, 
198°
• Obernai
		22.5 km =14 mi, 
6°
• Endingen, DE
		22.9 km =14.2 mi, 
125°
• Barr
		16.2 km =10.1 mi, 
359°
• Sainte-Marie-aux-Mines
		19.7 km =12.2 mi, 
264°
• Vogtsburg, DE
		23.3 km =14.5 mi, 
142°
• Horbourg-Wihr
		20.5 km =12.7 mi, 
191°
• Benfeld
		16.1 km =10 mi, 
41°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016