Night Light of Beidao (Gansu) from space (China) Src. Average luminocity for 10x10km area is 35.1329% and for 50x50km: 4.7243%.
Square area 10x10 km:
 4.02%
 4.2%
 4.2%
 9.44%
 7.52%
 2.62%
 1.57%
 2.27%
 3.15%
 46.68%
 14.34%Square area 50x50 km:
 0.64%
 0.8%
 0.46%
 0.71%
 0.5%
 0.39%
 0.34%
 0.43%
 0.59%
 6.17%
 88.98%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
35° 8' 44.1" North, 105° 11' 24.8" East
34° 34' 7" North, 105° 53' 36" East
33° 59' 15.4" North, 106° 35' 47.3" East
Some cities around Beidao sort by population:
• Tianshui
		13.9 km =8.6 mi, 
275°
• Lanzhou
		249.2 km =154.8 mi, 
311°
• Guangyuan
		236.5 km =147 mi, 
181°
• Hanzhong
		196.1 km =121.9 mi, 
147°
• Pingliang
		129.8 km =80.7 mi, 
33°
• Guozhen
		136.2 km =84.6 mi, 
99°
• Yuxia
		257.5 km =160 mi, 
102°
• Mawu
		91.1 km =56.6 mi, 
259°
Sources (retrieved 2019-11-25):
» NASA, Earths city lights 1995
» NASA city lights 2003
» Earth at Night: Flat Maps 2012, 2016