Help for PHO_IRVINE

PURPOSE:

This is the sub-menu associated with Irvine's photometric
function. This function needs three input parameters:
 EXPONENT, IRV_EXP1, IRV_EXP2.




MATHEMATICAL BACKGROUND :

bidirectional reflectance [1/str] :

r(i,e,g)=( cos(i)*cos(e) )**EXPONENT) / cos(e) * (1-exp(-cos(i)*IRV_EXP1))/(1-exp(-cos(e)*IRV_EXP2))


REFERENCES :
old VICAR Photometry programs

PROGRAMMER:

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

PARAMETERS: