Night Light of San Fernando (Tamaulipas) from space (Mexico) Src. Average luminocity for 10x10km area is 28.089% and for 50x50km: 1.7974%.
Square area 10x10 km:
 2.27%
 4.92%
 3.6%
 5.49%
 4.17%
 2.08%
 3.22%
 6.06%
 1.33%
 26.89%
 39.96%Square area 50x50 km:
 0.09%
 0.2%
 0.15%
 0.31%
 0.3%
 0.21%
 0.39%
 0.5%
 0.17%
 1.18%
 96.5%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
25° 29' 1.9" North, 98° 51' 5.1" West
24° 50' 51" North, 98° 8' 53.8" West
24° 12' 28.2" North, 97° 26' 42.6" West
Some cities around San Fernando sort by population:
• Heroica Matamoros
		131.8 km =81.9 mi, 
29°
• Brownsville, US
		134.2 km =83.4 mi, 
29°
• Ciudad Río Bravo
		126.9 km =78.9 mi, 
2°
• Valle Hermoso
		97.7 km =60.7 mi, 
20°
• Soto la Marina
		120 km =74.6 mi, 
182°
• Abasolo
		90.6 km =56.3 mi, 
194°
• Nueva Villa de Padilla
		117.1 km =72.8 mi, 
220°
• Santander Jiménez
		77.9 km =48.4 mi, 
205°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016