Reflectance values express the percentage of light that is reflected back from a surface, the difference having been absorbed or transmitted by the surface.
Definition of AXIAL. 1. : of, relating to, or having the characteristics of an axis.
radial definition: 1. 2. of or like a ray or rays; branching out in all directions from a common center 3. having or characterized by parts that branch out in this way 4. of or situated like a radius 5. Anat. of or near the radius or forearmOrigin o...