Valka night lights from space
Night Light of Valka from space (Latvia) Src. Average luminocity for 10x10km area is 8.7023% and for 50x50km: 0.4086%.
Analysis of Valka night lights 2016
Square area 10x10 km:
100 
2.16%
90-99 2.73%
80-89 0.11%
70-79 0.23%
60-69 1.02%
50-59 0.8%
40-49 0.68%
30-39 0%
20-29 0%
10-19 0.91%
0-9 91.36%
2.16%90-99
2.73%80-89
0.11%70-79
0.23%60-69
1.02%50-59
0.8%40-49
0.68%30-39
0%20-29
0%10-19
0.91%0-9
91.36%Square area 50x50 km:
100 0.09%
90-99 0.11%
80-89 0.01%
70-79 0.02%
60-69 0.06%
50-59 0.03%
40-49 0.05%
30-39 0%
20-29 0%
10-19 0.04%
0-9 99.59%
0.09%90-99
0.11%80-89
0.01%70-79
0.02%60-69
0.06%50-59
0.03%40-49
0.05%30-39
0%20-29
0%10-19
0.04%0-9
99.59%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
58° 8' 53.5" North, 25° 18' 25.2" East
57° 46' 30.7" North, 26° 0' 36.5" East
57° 23' 53.9" North, 26° 42' 47.7" East
Some cities around Valka sort by population:
• Valmiera
43.3 km =26.9 mi, 
233°
• Valga, EE
2.2 km =1.4 mi, 
82°
• Smiltene
39.5 km =24.5 mi, 
189°
• Rūjiena
42.4 km =26.3 mi, 
288°
• Strenči
25.5 km =15.8 mi, 229°
• Ape
48.3 km =30 mi, 
122°
• Mūrmuiža
45.6 km =28.3 mi, 
222°
• Naukšēni
34.9 km =21.7 mi, 290°
454572 (p: 6,589)
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016