### 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 language | English |
---|---|

Pages (from-to) | 1545-1551 |

Number of pages | 7 |

Journal | Remote Sensing of Environment |

Volume | 112 |

Issue number | 4 |

DOIs | |

Publication status | Published - 15 Apr 2008 |

MoE publication type | A1 Journal article-refereed |

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### Keywords

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

### Cite this

*Remote Sensing of Environment*,

*112*(4), 1545-1551. https://doi.org/10.1016/j.rse.2007.08.002

}

*Remote Sensing of Environment*, vol. 112, no. 4, pp. 1545-1551. https://doi.org/10.1016/j.rse.2007.08.002

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

Research output: Contribution to journal › Article › Scientific › peer-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

VL - 112

SP - 1545

EP - 1551

JO - Remote Sensing of Environment

JF - Remote Sensing of Environment

SN - 0034-4257

IS - 4

ER -