Night Light of Guye (Hebei) from space (China) Src. Average luminocity for 10x10km area is 53.6364% and for 50x50km: 23.1255%.
Square area 10x10 km:
 7.14%
 7.14% 6.17%
 6.17% 10.71%
 10.71% 6.66%
 6.66% 8.6%
 8.6% 15.1%
 15.1% 7.47%
 7.47% 10.39%
 10.39% 19.32%
 19.32% 8.44%
 8.44% 0%
 0%Square area 50x50 km:
 3.68%
 3.68% 2.69%
 2.69% 2.16%
 2.16% 2.49%
 2.49% 3.3%
 3.3% 4.89%
 4.89% 3.45%
 3.45% 5.53%
 5.53% 6.88%
 6.88% 15.3%
 15.3% 49.62%
 49.62%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
40° 16' 9" North, 117° 44' 15.8" East
39° 43' 49.9" North, 118° 26' 27.1" East
39° 11' 15.6" North, 119° 8' 38.3" East
Some cities around Guye sort by population:
• Tangshan
		24.5 km =15.2 mi,  243°
243°
• Linxi
		2.2 km =1.4 mi,  160°
160°
• Zhaogezhuang
		4.6 km =2.9 mi,  327°
327°
• Tangjiazhuang
		1.7 km =1.1 mi,  31°
31°
• Fengrun
		30 km =18.6 mi,  292°
292°
• Changli
		60.8 km =37.8 mi,  92°
92°
• Songling
		64.2 km =39.9 mi,  346°
346°
• Fengtai
		62.2 km =38.6 mi,  252°
252°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016