Modeling the directional reflectance from complete homogeneous vegetation canopies with various leaf-orientation distributions

Journal Article · Sun Jul 01 04:00:00 EDT 1984 · J. Opt. Soc. Am. A; (United States)

DOI:https://doi.org/10.1364/JOSAA.1.000725· OSTI ID:5991016

Kimes, D S

The directional-reflectance distributions of radiant flux from homogeneous vegetation canopies with greater than 90% ground cover are analyzed with a radiative-transfer model. The model assumes that the leaves consist of small finite planes with Lambertian properties. Four theoretical canopies with different leaf-orientataion distributions were studied: erectophile, spherical, planophile, and heliotropic canopies. The directional-reflectance distributions from the model closely resemble reflectance distributions measured in the field. The physical scattering mechanisms operating in the model explain the variations observed in the reflectance distributions as a function of leaf-orientation distribution, solar zenith angle, and leaf transmittance and reflectance. The simulated reflectance distributions show unique charateristics for each canopy. The basic understanding of the physical scattering properties of the different canopy geometries gained in this study provide a basis for developing techniques to infer leaf-orientation distributions of vegetation canopies from directional remote-sensing measurements.

• Research Organization: NASA Goddard Space Flight Center, Earth Resources Branch, Code 923, Greenbelt, Maryland 20771
• OSTI ID: 5991016
• Journal Information: J. Opt. Soc. Am. A; (United States), Journal Name: J. Opt. Soc. Am. A; (United States) Vol. 1:7; ISSN JOAOD
• Country of Publication: United States
• Language: English

Related Subjects

500100* -- Environment
Atmospheric-- Basic Studies-- (-1989)
54 ENVIRONMENTAL SCIENCES
ALGORITHMS
ANGULAR DISTRIBUTION
CANOPIES
COORDINATES
DISTRIBUTION
DISTRIBUTION FUNCTIONS
ENERGY TRANSFER
FUNCTIONS
GROUND COVER
HEAT TRANSFER
LEAVES
LIGHT SCATTERING
MATHEMATICAL LOGIC
MATHEMATICAL MODELS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
PLANTS
RADIANT HEAT TRANSFER
RADIATION FLUX
REFLECTIVITY
REMOTE SENSING
SCATTERING
SURFACE PROPERTIES
THREE-DIMENSIONAL CALCULATIONS
TRANSFER FUNCTIONS