Night Light of Daigo (Ibaraki) from space (Japan) Src. Average luminocity for 10x10km area is 6.5734% and for 50x50km: 2.2413%.
Square area 10x10 km:
 0%
 1.22%
 0.17%
 0.52%
 0.87%
 0.35%
 2.97%
 1.92%
 3.15%
 1.4%
 87.41%Square area 50x50 km:
 0.03%
 0.29%
 0.15%
 0.16%
 0.17%
 0.45%
 0.39%
 0.44%
 1.09%
 1.64%
 95.18%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
37° 19' 40.3" North, 139° 38' 48.8" East
36° 46' 0" North, 140° 21' 0" East
36° 12' 4.9" North, 141° 3' 11.3" East
Some cities around Daigo sort by population:
• Hitachi
		32.5 km =20.2 mi, 
124°
• Kuroiso
		34.7 km =21.6 mi, 
309°
• Ōtawara
		30.3 km =18.8 mi, 
291°
• Takahagi
		33.1 km =20.6 mi, 
99°
• Ujiie
		35.4 km =22 mi, 
254°
• Ōmiya
		24.8 km =15.4 mi, 
166°
• Motegi
		31.5 km =19.6 mi, 
208°
• Karasuyama
		22 km =13.7 mi, 
233°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016