Night Light of Longgang (Shandong) from space (China) Src. Average luminocity for 10x10km area is 50.4014% and for 50x50km: 10.4039%.
Square area 10x10 km:
 3.23%
 5.95%
 10.03%
 8.33%
 13.1%
 15.48%
 2.38%
 6.63%
 18.03%
 16.84%
 0%Square area 50x50 km:
 0.5%
 0.85%
 1.15%
 2.04%
 1.94%
 1.98%
 1.42%
 2.35%
 3.38%
 8.18%
 76.22%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
38° 12' 23.1" North, 119° 37' 39" East
37° 39' 6.5" North, 120° 19' 50.3" East
37° 5' 34.9" North, 121° 2' 1.5" East
Some cities around Longgang sort by population:
• Yantai
		99.8 km =62 mi, 
101°
• Laizhou
		62.6 km =38.9 mi, 
213°
• Laiyang
		82.4 km =51.2 mi, 
155°
• Zhaoyuan
		32.7 km =20.3 mi, 
167°
• Dengzhou
		41.5 km =25.8 mi, 
65°
• Zhuangyuan
		58.3 km =36.2 mi, 
131°
• Laixi
		89.8 km =55.8 mi, 
168°
• Qingyang
		83.5 km =51.9 mi, 
101°
Sources (retrieved 2019-11-25):
» NASA, Earths city lights 1995
» NASA city lights 2003
» Earth at Night: Flat Maps 2012, 2016