Shoot scattering phase function for Scots pine and its effect on canopy reflectance

Matti Mõttus, Miina Rautiainen, Michael E. Schaepman

Research output: Contribution to journalArticleScientificpeer-review

13 Citations (Scopus)

Abstract

Spectral and directional reflectance properties of coniferous forests are known to differ from those of broadleaf forests. Many reasons have been proposed for this, including differences in the optical properties of leaves and shoots, the latter being considered the basic unit in radiative transfer modeling of a coniferous canopy. Unfortunately, very little empirical data is available on the spectrodirectional scattering properties of shoots. Here, we present results of angular measurements (using an ASD FieldSpec 3 spectroradiometer mounted on LAGOS) of ten Scots pine shoots in the spectral range 400-2000. nm. The shoots were found to scatter anisotropically with most of the radiation reflected back into the hemisphere where the radiation source was positioned. To describe the measured directional scattering pattern, we propose a phase function consisting of isotropic and Lambertian scattering components. Next, we used the proposed scattering phase function in a Monte Carlo radiative transfer model. Angular reflectance of a modeled horizontally homogeneous shoot canopy has, due to shoot scattering anisotropy, an enhanced " dark spot" as compared with a canopy composed of isotropic scatterers and a quantitatively similar leaf canopy.

Original languageEnglish
Number of pages1
JournalAgricultural and Forest Meteorology
Volume154-155
DOIs
Publication statusPublished - 1 Jan 2012
MoE publication typeA1 Journal article-refereed

Fingerprint

canopy reflectance
Pinus sylvestris
reflectance
shoot
scattering
canopy
shoots
radiative transfer
spectroradiometers
optical properties
coniferous forest
optical property
coniferous forests
effect
leaves
anisotropy
modeling

Keywords

  • Dark spot
  • Pinus sylvestris
  • Radiative transfer in vegetation canopy
  • Scattering phase function

Cite this

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abstract = "Spectral and directional reflectance properties of coniferous forests are known to differ from those of broadleaf forests. Many reasons have been proposed for this, including differences in the optical properties of leaves and shoots, the latter being considered the basic unit in radiative transfer modeling of a coniferous canopy. Unfortunately, very little empirical data is available on the spectrodirectional scattering properties of shoots. Here, we present results of angular measurements (using an ASD FieldSpec 3 spectroradiometer mounted on LAGOS) of ten Scots pine shoots in the spectral range 400-2000. nm. The shoots were found to scatter anisotropically with most of the radiation reflected back into the hemisphere where the radiation source was positioned. To describe the measured directional scattering pattern, we propose a phase function consisting of isotropic and Lambertian scattering components. Next, we used the proposed scattering phase function in a Monte Carlo radiative transfer model. Angular reflectance of a modeled horizontally homogeneous shoot canopy has, due to shoot scattering anisotropy, an enhanced {"} dark spot{"} as compared with a canopy composed of isotropic scatterers and a quantitatively similar leaf canopy.",
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Shoot scattering phase function for Scots pine and its effect on canopy reflectance. / Mõttus, Matti; Rautiainen, Miina; Schaepman, Michael E.

In: Agricultural and Forest Meteorology, Vol. 154-155, 01.01.2012.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Shoot scattering phase function for Scots pine and its effect on canopy reflectance

AU - Mõttus, Matti

AU - Rautiainen, Miina

AU - Schaepman, Michael E.

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N2 - Spectral and directional reflectance properties of coniferous forests are known to differ from those of broadleaf forests. Many reasons have been proposed for this, including differences in the optical properties of leaves and shoots, the latter being considered the basic unit in radiative transfer modeling of a coniferous canopy. Unfortunately, very little empirical data is available on the spectrodirectional scattering properties of shoots. Here, we present results of angular measurements (using an ASD FieldSpec 3 spectroradiometer mounted on LAGOS) of ten Scots pine shoots in the spectral range 400-2000. nm. The shoots were found to scatter anisotropically with most of the radiation reflected back into the hemisphere where the radiation source was positioned. To describe the measured directional scattering pattern, we propose a phase function consisting of isotropic and Lambertian scattering components. Next, we used the proposed scattering phase function in a Monte Carlo radiative transfer model. Angular reflectance of a modeled horizontally homogeneous shoot canopy has, due to shoot scattering anisotropy, an enhanced " dark spot" as compared with a canopy composed of isotropic scatterers and a quantitatively similar leaf canopy.

AB - Spectral and directional reflectance properties of coniferous forests are known to differ from those of broadleaf forests. Many reasons have been proposed for this, including differences in the optical properties of leaves and shoots, the latter being considered the basic unit in radiative transfer modeling of a coniferous canopy. Unfortunately, very little empirical data is available on the spectrodirectional scattering properties of shoots. Here, we present results of angular measurements (using an ASD FieldSpec 3 spectroradiometer mounted on LAGOS) of ten Scots pine shoots in the spectral range 400-2000. nm. The shoots were found to scatter anisotropically with most of the radiation reflected back into the hemisphere where the radiation source was positioned. To describe the measured directional scattering pattern, we propose a phase function consisting of isotropic and Lambertian scattering components. Next, we used the proposed scattering phase function in a Monte Carlo radiative transfer model. Angular reflectance of a modeled horizontally homogeneous shoot canopy has, due to shoot scattering anisotropy, an enhanced " dark spot" as compared with a canopy composed of isotropic scatterers and a quantitatively similar leaf canopy.

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