Night Light of Zhangjiagang (Jiangsu) from space (China) Src. Average luminocity for 10x10km area is 86.9249% and for 50x50km: 61.1321%.
Square area 10x10 km:
 21.61%
 21.61% 29.49%
 29.49% 17.58%
 17.58% 16.12%
 16.12% 15.02%
 15.02% 0.18%
 0.18% 0%
 0% 0%
 0% 0%
 0% 0%
 0% 0%
 0%Square area 50x50 km:
 6.72%
 6.72% 8.92%
 8.92% 9.61%
 9.61% 10.64%
 10.64% 15.55%
 15.55% 16.99%
 16.99% 12.46%
 12.46% 8.68%
 8.68% 5.91%
 5.91% 3.07%
 3.07% 1.46%
 1.46%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
32° 27' 36.8" North, 119° 50' 8.8" East
31° 51' 54" North, 120° 32' 20" East
31° 15' 57.3" North, 121° 14' 31.3" East
Some cities around Zhangjiagang sort by population:
• Suzhou
		62.6 km =38.9 mi,  175°
175°
• Wuxi
		40.6 km =25.2 mi,  215°
215°
• Changshu City
		31 km =19.3 mi,  141°
141°
• Changzhou
		56.2 km =34.9 mi,  259°
259°
• Nantong
		36.6 km =22.7 mi,  59°
59°
• Jiangyin
		26.5 km =16.5 mi,  281°
281°
• Jinsha
		56.3 km =35 mi,  63°
63°
• Taixing
		59.8 km =37.2 mi,  304°
304°
Sources (retrieved 2019-11-25):
» NASA, Earths city lights 1995
» NASA city lights 2003
» Earth at Night: Flat Maps 2012, 2016