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    Model ID: M00039
    Model Name: LIBERTY Model
    Encoders:
    No. Name Affiliations
    1
    Dawson
    terry.dawson@ecu.ox.ac.uk
    Key words: LIBERTY, needle structures
    Model Type: Theoretical model
    Latest Modified:
    Submission Date:
    Abstract: Needle leaf has a special structure: it is no significant palisade tissue, and almost all of the cells are spherical within cross section.
    Equation:
    1
    Name: Average internal cell diameter
    Parameter type: int
    Physic Entity: Average internal cell diameter
    2
    Name: Intercellular air space determinant
    Parameter type: double
    Physic Entity: Intercellular air space determinant
    3
    Name: Baseline absorption
    Parameter type: double
    Physic Entity: Baseline absorption
    4
    Name: Albino absorption
    Parameter type: double
    Physic Entity: Albino absorption
    5
    Name: Leaf thickness
    Parameter type: double
    Physic Entity: Leaf thickness
    6
    Name: Chlorophyll content (mg/g)
    Parameter type: double
    Physic Entity: Chlorophyll content (mg/g)
    7
    Name: Water content (% dry mass)
    Parameter type: double
    Physic Entity: Water content (% dry mass)
    8
    Name: Nitrogen content (% dry mass)
    Parameter type: double
    Physic Entity: Nitrogen content (% dry mass)
    9
    Name: Lignin content (% dry mass)
    Parameter type: double
    Physic Entity: Lignin content (% dry mass)
    Title: LIBERTY—Modeling the Effects of Leaf Biochemical Concentration on Reflectance Spectra
    Authors:
    No. Name Affiliations
    1
    Terence P. Dawson
    2
    Paul J. Curran
    3
    Stephen E. Plummer
    Cited by: REMOTE SENS. ENVIRON
    Abstract: The conifer leaf model LIBERTY (Leaf Incorporating Biochemistry Exhibiting Ref lectance and Transmittance Yields) is an adaptation of radiative transfer theory for determining the optical properties of powders. LIBERTY provides a simulation, at a fine spectral resolution, of quasiinfinite leaf ref lectance (as represented by stacked leaves) and single leaf ref lectance. Single leaf reflectance and transmittance are important input variables to vegetation canopy ref lectance models. A prototype parameterization of LIBERTY was based upon measurements of pine needles and known absorption coefficients of pure component leaf biochemicals. The estimated infinite-ref lectance output was compared with the spectra of both dried and fresh pine needles with root mean square errors (RMSE) of 2.87% and 1.73%, respectively. The comparisons between measured and estimated ref lectance and transmittance values for single needles were also very accurate with RSME of 1.84% and 1.12%, respectively. Initial inversion studies have demonstrated that significant improvements can be made to LIBERTY by utilizing in vivo absorption coefficients which have been determined by the inversion process. These results demonstrate the capability of LIBERTY to model accurately the spectral response of pine needles.

    Equation