Image 38

original lighter colour coded

and with an inserted data grid:

(in the middle of tiles, median of raw G-pixels values is given, the bottom value is the tile luminance divided by one candela per square meter). 


  Luminance scale / 1 
cd/m<sup>2</sup>

   Logarithmic luminance scale (the unit is candela per square meter)
   – intensities of snow illuminance in lux would be obtained by 
   multiplying the numeric value of luminance by 3.6. For asphalt, 
   such a coefficient is between 20 and 40 
   (or much less, for specular reflection of distant lamps)