Night Light of Langzhong (Sichuan) from space (China) Src. Average luminocity for 10x10km area is 31.9213% and for 50x50km: 3.4089%.
Square area 10x10 km:
 6.47%
 6.12%
 3.67%
 2.62%
 5.42%
 3.67%
 3.32%
 0.7%
 4.72%
 33.22%
 30.07%Square area 50x50 km:
 0.54%
 0.62%
 0.26%
 0.28%
 0.51%
 0.41%
 0.4%
 0.18%
 0.47%
 3.08%
 93.24%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
32° 8' 51.5" North, 105° 17' 26.5" East
31° 33' 1.3" North, 105° 59' 37.7" East
30° 56' 57.3" North, 106° 41' 49" East
Some cities around Langzhong sort by population:
• Nanchong
		84.4 km =52.4 mi, 
174°
• Mianyang
		124.7 km =77.5 mi, 
265°
• Guangyuan
		100.4 km =62.4 mi, 
350°
• Gaoping
		86.8 km =53.9 mi, 
173°
• Jiangyou
		123.2 km =76.6 mi, 
281°
• Suining
		122.6 km =76.2 mi, 
199°
• Nanlong
		22.9 km =14.2 mi, 
163°
• Tongchuan
		99.9 km =62.1 mi, 
239°
Sources (retrieved 2019-11-25):
» NASA, Earths city lights 1995
» NASA city lights 2003
» Earth at Night: Flat Maps 2012, 2016