Night Light of Geraardsbergen (Flanders) from space (Belgium) Src. Average luminocity for 10x10km area is 30.1821% and for 50x50km: 29.6283%.
Square area 10x10 km:
 0.98%
 2.38%
 3.5%
 4.06%
 3.92%
 5.18%
 4.9%
 7.42%
 14.43%
 47.76%
 5.46%Square area 50x50 km:
 2.13%
 3.23%
 2.54%
 3.74%
 4.05%
 6.64%
 8.33%
 7.95%
 11.17%
 21.01%
 29.21%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
51° 12' 57.5" North, 3° 10' 44.8" East
50° 46' 24.3" North, 3° 52' 56" East
50° 19' 36" North, 4° 35' 7.3" East
Some cities around Geraardsbergen sort by population:
• Ninove
		11.8 km =7.3 mi, 
59°
• Zottegem
		11.8 km =7.3 mi, 
334°
• Lessines
		7.7 km =4.8 mi, 
205°
• Herzele
		12.6 km =7.8 mi, 
2°
• Galmaarden
		6.6 km =4.1 mi, 
109°
• Silly
		14.2 km =8.8 mi, 
168°
• Herne
		12 km =7.5 mi, 
117°
• Sint-Maria-Lierde
		5.7 km =3.5 mi, 
332°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016