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

Show full item record

Permalink

http://hdl.handle.net/10138/35449

Citation

Mõttus , M , Rautiainen , M & Schaepman , M E 2012 , ' Shoot scattering phase function for Scots pine and its effect on canopy reflectance ' Agricultural and Forest Meteorology , vol 154-155 , pp. 67-74 . , 10.1016/j.agrformet.2011.10.012

Title: Shoot scattering phase function for Scots pine and its effect on canopy reflectance
Author: Mõttus, Matti; Rautiainen, Miina; Schaepman, Michael E.
Contributor: University of Helsinki, Department of Geosciences and Geography
University of Helsinki, Department of Forest Sciences
Belongs to series: Agricultural and Forest Meteorology
ISSN: 0168-1923
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.
Peer review status: Peer reviewed
URI: http://hdl.handle.net/10138/35449
Date: 2012
Subject: Radiative transfer in vegetation canopy
Pinus sylvestris
Scattering phase function
dark spot
RADIATIVE-TRANSFER
NEEDLES
LEAVES
MODELS
INDEX
STAND
4112 Forestry


Files in this item

Total number of downloads: Loading...

Files Size Format View
shoot_brdf_ver2_2column.pdf 1.204Mb PDF View/Open

This item appears in the following Collection(s)

Show full item record