This file contains parameters for two components, the normalization model and the photometric model.

Normalization Model: Albedo

Definition from ISIS (USGS Integrated Software for Imagers and Spectrometers 3, 2024, DOI: 10.5066/P13YBMZA; Laura et al., 2024) Docs: Normalization without atmosphere. Each pixel is divided by the model photometric function evaluated at the geometry of that pixel, then multiplied by the function at reference geometry with incidence and phase angles equal to incref and emission angle at 0 degree. This has the effect of removing brightness variations due to incidence angle and showing relative albedo variations with the same contrast everywhere. If topographic shading is present, it will be amplified more in regions of low incidence angle and will not appear uniform.

Parameters: 

Albedo = Albedo
Incref = Reference incidence angle
Incmat = Photometric transition incidence angle 
Thresh = Amplification threshold

Photometric Model: HapkeHen

Definition from ISIS Docs: Derive model albedo using the complete Hapke model with Henyey-Greenstein single-particle phase function whose coefficients are Hg1 and Hg2, plus single scattering albedo wh, opposition surge parameters Hh and B0, and macroscopic roughness Theta.


Object = NormalizationModel
  Group = Algorithm
    Name = Albedo
    Albedo = 1.0
    Incref = 30.0
    Incmat = 0.0
    Thresh = 30.0
  EndGroup
EndObject
Object = PhotometricModel
  Group  = Algorithm
    Name = HapkeHen
    Wh = 0.12
    Hg1 = 0.35
    Hg2 = 0.38
    Theta = 21.0
    Hh = 0.06
    B0 = 1.6
  EndGroup
EndObject