Night Light of Sandim (Porto) from space (Portugal) Src. Average luminocity for 10x10km area is 75.0204% and for 50x50km: 47.2683%.
Square area 10x10 km:
 11.56%
 11.56% 15.99%
 15.99% 17.18%
 17.18% 21.26%
 21.26% 13.61%
 13.61% 6.63%
 6.63% 7.31%
 7.31% 5.78%
 5.78% 0.68%
 0.68% 0%
 0% 0%
 0%Square area 50x50 km:
 13.2%
 13.2% 9.3%
 9.3% 5.3%
 5.3% 6.63%
 6.63% 7.59%
 7.59% 5.7%
 5.7% 4.81%
 4.81% 5.37%
 5.37% 7.84%
 7.84% 8.27%
 8.27% 25.99%
 25.99%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
41° 33' 47.9" North, 9° 12' 36.5" West
41° 2' 6.3" North, 8° 30' 25.2" West
40° 30' 9.3" North, 7° 48' 14" West
Some cities around Sandim sort by population:
• Grijó
		6.2 km =3.9 mi,  263°
263°
• Lourosa
		6.8 km =4.2 mi,  213°
213°
• Argoncilhe
		2.9 km =1.8 mi,  248°
248°
• Fiães
		4.8 km =3 mi,  198°
198°
• Foz do Sousa
		6.9 km =4.3 mi,  3°
3°
• Perozinho
		7.4 km =4.6 mi,  296°
296°
• Lobão
		5.7 km =3.5 mi,  161°
161°
• Olival
		3.5 km =2.2 mi,  298°
298°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016