Night Light of Boulogne-sur-Mer (Hauts-de-France) from space (France) Src. Average luminocity for 10x10km area is 41.5455% and for 50x50km: 5.3248%.
Square area 10x10 km:
 9.89%
 9.89% 11.9%
 11.9% 3.74%
 3.74% 2.81%
 2.81% 2.14%
 2.14% 2.67%
 2.67% 3.34%
 3.34% 2.94%
 2.94% 18.85%
 18.85% 31.55%
 31.55% 10.16%
 10.16%Square area 50x50 km:
 1%
 1% 1.18%
 1.18% 0.47%
 0.47% 0.36%
 0.36% 0.46%
 0.46% 0.47%
 0.47% 0.54%
 0.54% 0.6%
 0.6% 1.76%
 1.76% 4%
 4% 89.16%
 89.16%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
51° 10' 7.3" North, 0° 54' 38.9" East
50° 43' 32.6" North, 1° 36' 50.1" East
50° 16' 42.6" North, 2° 19' 1.4" East
Some cities around Boulogne-sur-Mer sort by population:
• Outreau
		2.8 km =1.7 mi,  216°
216°
• Saint-Martin-Boulogne
		0.4 km =0.2 mi,  68°
68°
• Étaples
		22.7 km =14.1 mi,  176°
176°
• Le Portel
		3.5 km =2.2 mi,  230°
230°
• Wimereux
		4.9 km =3 mi,  357°
357°
• Le Touquet-Paris-Plage
		22.5 km =14 mi,  185°
185°
• Desvres
		16.8 km =10.4 mi,  112°
112°
• Saint-Étienne-au-Mont
		5.4 km =3.4 mi,  167°
167°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016