A simple parameterization of canopy reflectance using photon recollision probability

Matti Mõttus, Pauline Stenberg

Research output: Contribution to journalArticleScientificpeer-review

33 Citations (Scopus)

Abstract

Information on the fractions of incident radiation reflected, transmitted and absorbed by a plant canopy is crucial in remote sensing of vegetation and modeling of canopy microclimate. Photon recollision probability p allows to calculate easily the spectral behavior of canopy scattering, i.e. the sum of canopy reflectance and transmittance. However, to divide the scattered radiation into reflected and transmitted fluxes, additional models are needed. In this paper, we present a simple formula to estimate the fraction of radiation scattered upwards by a canopy. The new method is semi-empirical, makes use of the concept of photon recollision probability, and is derived from an analysis of modeling results. Although a physical interpretation is given for the single additional parameter needed in the formula, the scattering asymmetry parameter q, the method is not strictly based on the radiative transfer equation. Our results indicate that the method is accurate for low to moderate leaf area index (LAI) values, and provides a reasonable approximation even at LAI = 8. In addition, we present a method to compute p using numerical radiative transfer models.

Original languageEnglish
Pages (from-to)1545-1551
Number of pages7
JournalRemote Sensing of Environment
Volume112
Issue number4
DOIs
Publication statusPublished - 15 Apr 2008
MoE publication typeA1 Journal article-refereed

Fingerprint

canopy reflectance
Parameterization
reflectance
parameterization
Photons
Radiative transfer
canopy
Radiation
leaf area index
radiative transfer
scattering
Scattering parameters
Remote sensing
transmittance
microclimate
Scattering
Fluxes
modeling
asymmetry
methodology

Keywords

  • Canopy reflectance
  • Photon recollision probability
  • Radiative transfer modeling in plant canopies

Cite this

@article{05d69dedfce849c98328d2173acb908d,
title = "A simple parameterization of canopy reflectance using photon recollision probability",
abstract = "Information on the fractions of incident radiation reflected, transmitted and absorbed by a plant canopy is crucial in remote sensing of vegetation and modeling of canopy microclimate. Photon recollision probability p allows to calculate easily the spectral behavior of canopy scattering, i.e. the sum of canopy reflectance and transmittance. However, to divide the scattered radiation into reflected and transmitted fluxes, additional models are needed. In this paper, we present a simple formula to estimate the fraction of radiation scattered upwards by a canopy. The new method is semi-empirical, makes use of the concept of photon recollision probability, and is derived from an analysis of modeling results. Although a physical interpretation is given for the single additional parameter needed in the formula, the scattering asymmetry parameter q, the method is not strictly based on the radiative transfer equation. Our results indicate that the method is accurate for low to moderate leaf area index (LAI) values, and provides a reasonable approximation even at LAI = 8. In addition, we present a method to compute p using numerical radiative transfer models.",
keywords = "Canopy reflectance, Photon recollision probability, Radiative transfer modeling in plant canopies",
author = "Matti M{\~o}ttus and Pauline Stenberg",
year = "2008",
month = "4",
day = "15",
doi = "10.1016/j.rse.2007.08.002",
language = "English",
volume = "112",
pages = "1545--1551",
journal = "Remote Sensing of Environment",
issn = "0034-4257",
publisher = "Elsevier",
number = "4",

}

A simple parameterization of canopy reflectance using photon recollision probability. / Mõttus, Matti; Stenberg, Pauline.

In: Remote Sensing of Environment, Vol. 112, No. 4, 15.04.2008, p. 1545-1551.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - A simple parameterization of canopy reflectance using photon recollision probability

AU - Mõttus, Matti

AU - Stenberg, Pauline

PY - 2008/4/15

Y1 - 2008/4/15

N2 - Information on the fractions of incident radiation reflected, transmitted and absorbed by a plant canopy is crucial in remote sensing of vegetation and modeling of canopy microclimate. Photon recollision probability p allows to calculate easily the spectral behavior of canopy scattering, i.e. the sum of canopy reflectance and transmittance. However, to divide the scattered radiation into reflected and transmitted fluxes, additional models are needed. In this paper, we present a simple formula to estimate the fraction of radiation scattered upwards by a canopy. The new method is semi-empirical, makes use of the concept of photon recollision probability, and is derived from an analysis of modeling results. Although a physical interpretation is given for the single additional parameter needed in the formula, the scattering asymmetry parameter q, the method is not strictly based on the radiative transfer equation. Our results indicate that the method is accurate for low to moderate leaf area index (LAI) values, and provides a reasonable approximation even at LAI = 8. In addition, we present a method to compute p using numerical radiative transfer models.

AB - Information on the fractions of incident radiation reflected, transmitted and absorbed by a plant canopy is crucial in remote sensing of vegetation and modeling of canopy microclimate. Photon recollision probability p allows to calculate easily the spectral behavior of canopy scattering, i.e. the sum of canopy reflectance and transmittance. However, to divide the scattered radiation into reflected and transmitted fluxes, additional models are needed. In this paper, we present a simple formula to estimate the fraction of radiation scattered upwards by a canopy. The new method is semi-empirical, makes use of the concept of photon recollision probability, and is derived from an analysis of modeling results. Although a physical interpretation is given for the single additional parameter needed in the formula, the scattering asymmetry parameter q, the method is not strictly based on the radiative transfer equation. Our results indicate that the method is accurate for low to moderate leaf area index (LAI) values, and provides a reasonable approximation even at LAI = 8. In addition, we present a method to compute p using numerical radiative transfer models.

KW - Canopy reflectance

KW - Photon recollision probability

KW - Radiative transfer modeling in plant canopies

UR - http://www.scopus.com/inward/record.url?scp=40749124095&partnerID=8YFLogxK

U2 - 10.1016/j.rse.2007.08.002

DO - 10.1016/j.rse.2007.08.002

M3 - Article

AN - SCOPUS:40749124095

VL - 112

SP - 1545

EP - 1551

JO - Remote Sensing of Environment

JF - Remote Sensing of Environment

SN - 0034-4257

IS - 4

ER -