Night Light of Zhangye (Gansu) from space (China) Src. Average luminocity for 10x10km area is 54.4983% and for 50x50km: 3.5056%.
Square area 10x10 km:
Square area 50x50 km:
Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
39° 28' 44.4" North, 99° 44' 54.8" East
38° 56' 3" North, 100° 27' 6" East
38° 23' 6.5" North, 101° 9' 17.3" East
Some cities around Zhangye sort by population:
• Lanzhou
437.7 km =272 mi, 136°
• Xining
281.2 km =174.7 mi, 155°
• Wuwei
220.5 km =137 mi, 120°
• Baiyin
421.1 km =261.7 mi, 129°
• Jinchang
158.6 km =98.5 mi, 107°
• Jiayuguan
210.1 km =130.6 mi, 297°
• Laojunmiao
254.1 km =157.9 mi, 293°
• Jiuquan
189.1 km =117.5 mi, 298°
Sources (retrieved 2019-11-25):
» NASA, Earths city lights 1995
» NASA city lights 2003
» Earth at Night: Flat Maps 2012, 2016