Night Light of Rio Maior (Santarém) from space (Portugal) Src. Average luminocity for 10x10km area is 24.9031% and for 50x50km: 22.7653%.
Square area 10x10 km:
 2.89%
 3.23%
 5.27%
 1.53%
 2.55%
 2.55%
 1.7%
 3.4%
 5.27%
 38.27%
 33.33%Square area 50x50 km:
 1.17%
 2.38%
 2.11%
 2.4%
 3.4%
 3.91%
 3.58%
 4.41%
 9.88%
 28.3%
 38.47%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
39° 52' 44.5" North, 9° 38' 31.9" West
39° 20' 14.4" North, 8° 56' 20.6" West
38° 47' 29" North, 8° 14' 9.4" West
Some cities around Rio Maior sort by population:
• Monsanto
		23.9 km =14.9 mi, 
54°
• Caldas da Rainha
		18.6 km =11.6 mi, 
293°
• Alcobaça
		24.1 km =15 mi, 
352°
• Óbidos
		18.9 km =11.7 mi, 
277°
• Cartaxo
		23.6 km =14.7 mi, 
146°
• Benedita
		10.1 km =6.3 mi, 
344°
• Bombarral
		20.4 km =12.7 mi, 
247°
• Alcanede
		13.3 km =8.3 mi, 
49°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016