Help for PHO_HAPKE_81_LE2

PURPOSE:

In this PDF, the user is asked for the only parameters needed for the 
Hapke-1981-two-term-Legendre-Polynomial photometric function.

MATHEMATICAL BACKGROUND :


bidirectional reflectance [1/str] :

r(i,e,g) = ...


REFERENCE :
Bruce Hapke, Bidirectional Reflectance Spectroscopy.
1. Theory
   Journal of Geophysical Research Vol. 86, No.. B4, p. 3039-3054

PROGRAMMER:

Friedel Oschuetz
Institute of Planetary Exploration
DLR
12484 Berlin (FRG)

PARAMETERS: