> These "reflection" numbers in pov-ref.txt file are extracted from a image,which
> with location and reflective information for 40000 points.We call this image a
> reflecity image in remote sensing.This image is photoed by flight.Thank you for
> your advice.I go to have a try!Gratitudes!

I must admit I don't have much experience with OpenEXR output. What 
happens if you render the below scene to OpenEXR and check the 
luminance, what values to you get for different values of "ref"? Do they 
match up?

#version 3.7
global_settings {assumed_gamma 1}
#default{ finish{ ambient 0.0 diffuse 1.0 }}
camera
{
  orthographic
  location z
  look_at  0
  right    x*image_width/image_height
}
light_source{ <0,0,10> color rgb 1 }
#local ref = 0.5;
box { -1/2 1/2 pigment{ color rgb ref} }

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