Night Light of Grijó (Porto) from space (Portugal) Src. Average luminocity for 10x10km area is 94.2245% and for 50x50km: 43.0824%.
Square area 10x10 km:
 36.39%
 36.39% 38.78%
 38.78% 16.33%
 16.33% 8.5%
 8.5% 0%
 0% 0%
 0% 0%
 0% 0%
 0% 0%
 0% 0%
 0% 0%
 0%Square area 50x50 km:
 12.86%
 12.86% 8.85%
 8.85% 4.76%
 4.76% 5.8%
 5.8% 6.77%
 6.77% 4.71%
 4.71% 4.02%
 4.02% 4.47%
 4.47% 6.39%
 6.39% 7.63%
 7.63% 33.75%
 33.75%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
41° 33' 23.9" North, 9° 16' 59.9" West
41° 1' 42.1" North, 8° 34' 48.6" West
40° 29' 44.9" North, 7° 52' 37.4" West
Some cities around Grijó sort by population:
• São Félix da Marinha
		3.6 km =2.2 mi,  282°
282°
• Lourosa
		5.5 km =3.4 mi,  153°
153°
• Argoncilhe
		3.5 km =2.2 mi,  95°
95°
• Serzedo
		3.9 km =2.4 mi,  309°
309°
• Perozinho
		4.1 km =2.5 mi,  353°
353°
• Olival
		3.9 km =2.4 mi,  51°
51°
• Lamas
		4.8 km =3 mi,  168°
168°
• Nogueira da Regedoura
		2.7 km =1.7 mi,  201°
201°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016