Image 12

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). 











   In grid tiles, flux densities from these points and tiles are given.
   


  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)