Night Light of Castelo do Piauí (Piauí) from space (Brazil) Src. Average luminocity for 10x10km area is 6.9029% and for 50x50km: 0.4173%.
Square area 10x10 km:
 0%
 0.83%
 2.48%
 1.65%
 0.83%
 2.07%
 0.41%
 0%
 0%
 0%
 91.74%Square area 50x50 km:
 0.01%
 0.04%
 0.11%
 0.08%
 0.03%
 0.15%
 0.07%
 0%
 0.03%
 0%
 99.47%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
4° 37' 18.3" South, 42° 15' 20.3" West
5° 19' 20" South, 41° 33' 9" West
6° 1' 18.8" South, 40° 50' 57.8" West
Some cities around Castelo do Piauí sort by population:
• Crateús
		98.2 km =61 mi, 
80°
• Campo Maior
		87.6 km =54.4 mi, 
308°
• Altos
		105.3 km =65.4 mi, 
287°
• Pedro II
		100.3 km =62.3 mi, 
5°
• Novo Oriente
		89.3 km =55.5 mi, 
105°
• Elesbão Veloso
		117.5 km =73 mi, 
213°
• São Miguel do Tapuio
		32.4 km =20.1 mi, 
128°
• Beneditinos
		91.2 km =56.7 mi, 
261°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016