Night Light of Huantuo (Tianjin) from space (China) Src. Average luminocity for 10x10km area is 66.1769% and for 50x50km: 57.1304%.
Square area 10x10 km:
 2.38%
 2.38% 6.63%
 6.63% 18.54%
 18.54% 17.01%
 17.01% 18.88%
 18.88% 14.63%
 14.63% 14.63%
 14.63% 6.63%
 6.63% 0.68%
 0.68% 0%
 0% 0%
 0%Square area 50x50 km:
 18.73%
 18.73% 12.35%
 12.35% 8.93%
 8.93% 8.92%
 8.92% 7.22%
 7.22% 4.36%
 4.36% 4.02%
 4.02% 3.46%
 3.46% 3.62%
 3.62% 5.01%
 5.01% 23.38%
 23.38%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
39° 46' 8" North, 116° 37' 14.8" East
39° 13' 34.8" North, 117° 19' 26" East
38° 40' 46.4" North, 118° 1' 37.3" East
Some cities around Huantuo sort by population:
• Chitu
		7.3 km =4.5 mi,  110°
110°
• Zaojiacheng
		11.2 km =7 mi,  59°
59°
• Fanzhuang
		3.8 km =2.4 mi,  165°
165°
• Dongditou
		6.1 km =3.8 mi,  43°
43°
• Dabizhuang
		6.9 km =4.3 mi,  237°
237°
• Xiditou
		3.7 km =2.3 mi,  34°
34°
• Liukuaizhuang
		2.7 km =1.7 mi,  29°
29°
• Xiaodian
		8.9 km =5.5 mi,  290°
290°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016