22.3. How-To

The Balfour thermal model can be applied using the DIRSIG4 material file format. The following example shows a material that uses Generic Radsolver for radiometry and Balfour for thermal modeling.

MATERIAL_ENTRY {
    NAME = BalfourGrass
    ID = 10

    SURFACE_PROPERTIES {
        EMISSIVITY_PROP_NAME = ClassicEmissivity
        EMISSIVITY_PROP {
            FILENAME = normal_vegetation.ems
        }
    }

    TEMP_SOLVER_NAME = Balfour
    TEMP_SOLVER {
            A0 = -268.876160194144915
            A1 =    0.000006300078647
            A2 =    0.005678045932125
            A3 =    0.976967901967499
            A4 =    0.000415089719002
    }

    RAD_SOLVER_NAME = Generic
    RAD_SOLVER {
        INITIAL_SAMPLE_COUNT = 1
        MAX_BOUNCES = 2
        SAMPLE_DECAY_RATE = 10
    }
}

Note that the user only needs to specifiy the values for the five model fit coefficients.