Night Light of Delfzijl (Groningen) from space (Netherlands) Src. Average luminocity for 10x10km area is 19.0997% and for 50x50km: 6.3681%.
Square area 10x10 km:
 2.78%
 3.41%
 1.01%
 2.9%
 1.64%
 3.91%
 1.89%
 0.13%
 2.53%
 16.92%
 62.88%Square area 50x50 km:
 1.24%
 1.31%
 0.64%
 0.6%
 0.45%
 0.5%
 0.51%
 0.55%
 1.05%
 4.89%
 88.26%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
53° 44' 52.3" North, 6° 12' 53.8" East
53° 19' 48" North, 6° 55' 5" East
52° 54' 28.9" North, 7° 37' 16.3" East
Some cities around Delfzijl sort by population:
• Emden, DE
		19.7 km =12.2 mi, 
77°
• Veendam
		25 km =15.5 mi, 
185°
• Hoogezand
		21.4 km =13.3 mi, 
209°
• Winschoten
		22.1 km =13.7 mi, 
159°
• Appingedam
		4.1 km =2.5 mi, 
256°
• Sappemeer
		20.3 km =12.6 mi, 
204°
• Bedum
		21.2 km =13.2 mi, 
261°
• Hinte, DE
		20.1 km =12.5 mi, 
61°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016