Night Light of Erlangen (Bavaria) from space (Germany) Src. Average luminocity for 10x10km area is 44.2717% and for 50x50km: 13.2441%.
Square area 10x10 km:
 8.4%
 8.4%
 8.54%
 4.06%
 2.38%
 5.6%
 4.34%
 4.9%
 22.55%
 24.93%
 5.88%Square area 50x50 km:
 2.76%
 2.35%
 1.12%
 1.1%
 1.49%
 1.88%
 1.98%
 2.04%
 4.15%
 6.37%
 74.77%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
50° 2' 40.8" North, 10° 18' 17" East
49° 35' 27.6" North, 11° 0' 28.2" East
49° 7' 59.1" North, 11° 42' 39.5" East
Some cities around Erlangen sort by population:
• Fürth
		12.9 km =8 mi, 
186°
• Herzogenaurach
		9.2 km =5.7 mi, 
253°
• Neunkirchen am Brand
		9.1 km =5.7 mi, 
75°
• Heroldsberg
		12.5 km =7.8 mi, 
121°
• Baiersdorf
		7.7 km =4.8 mi, 
15°
• Veitsbronn
		12.3 km =7.6 mi, 
224°
• Hemhofen
		11.6 km =7.2 mi, 
332°
• Heroldsbach
		11.4 km =7.1 mi, 
356°
Sources (retrieved 2019-11-25):
» NASA, Earths city lights 1995
» NASA city lights 2003
» Earth at Night: Flat Maps 2012, 2016