Help for PHO_HAPKE_81_COOK


PURPOSE:

In this PDF, the user is asked for the only parameters needed for the 
Hapke-1981-two-term-Legendre-Polynomial bidirectional reflectance in the 
modification of Cook.

MATHEMATICAL BACKGROUND :


The Cook bidirectional reflectance is a modification to the 1981 Hapke one. 
The modification is in the redefining incidence and emission angles to their 
new values :
	cos(i) <-- sqrt(1-COOK*COOK*(1-cos(i)*cos(i)))
	cos(e) <-- sqrt(1-COOK*COOK*(1-cos(e)*cos(e)))



REFERENCE :
Old VICAR Photometry programs

PROGRAMMER:

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