A new parameterization of canopy spectral response to incident solar radiation: Case study with hyperspectral data from pine dominant forest

Yujie Wang (Corresponding Author), Wolfgang Buermann, Pauline Stenberg, Heikki Smolander, Tuomas Häme, Yuhong Tian, Jiannan Hu, Yuri Knyazikhin, Ranga B. Myneni

Research output: Contribution to journalArticleScientificpeer-review

47 Citations (Scopus)

Abstract

A small set of independent variables generally seems to suffice when attempting to describe the spectral response of a vegetation canopy to incident solar radiation. This set includes the soil reflectance, the single-scattering albedo, canopy transmittance, reflectance and interception, the portion of uncollided radiation in the total incident radiation, and portions of collided canopy transmittance and interception. All of these are measurable; they satisfy a simple system of equations and constitute a set that fully describes the law of energy conservation in vegetation canopies at any wavelength in the visible and near-infrared part of the solar spectrum. Further, the system of equations specifies the relationship between the optical properties at the leaf and the canopy scales. Thus, the information content of hyperspectral data can be fully exploited if these variables can be retrieved, for they can be more directly related to some of the physical properties of the canopy (e.g. leaf area index). This paper demonstrates this concept through retrievals of single-scattering albedo, canopy absorptance, portions of uncollided and collided canopy transmittance, and interception from hyperspectral data collected during a field campaign in Ruokolahti, Finland, June 14–21, 2000. The retrieved variables are then used to estimate canopy leaf area index, vegetation ground cover, and also the ratio of direct to total incident solar radiation at blue, green, red, and near-infrared spectral intervals.
Original languageEnglish
Pages (from-to)304-315
Number of pages12
JournalRemote Sensing of Environment
Volume85
Issue number3
DOIs
Publication statusPublished - 2003
MoE publication typeA1 Journal article-refereed

Fingerprint

Incident solar radiation
Parameterization
solar radiation
parameterization
Pinus
canopy
case studies
Scattering
Infrared radiation
Radiation
transmittance
interception
albedo (reflectance)
Energy conservation
Optical properties
Physical properties
Soils
leaf area index
Wavelength
reflectance

Keywords

  • vegetation canopy
  • parameterization
  • spectra

Cite this

Wang, Yujie ; Buermann, Wolfgang ; Stenberg, Pauline ; Smolander, Heikki ; Häme, Tuomas ; Tian, Yuhong ; Hu, Jiannan ; Knyazikhin, Yuri ; Myneni, Ranga B. / A new parameterization of canopy spectral response to incident solar radiation : Case study with hyperspectral data from pine dominant forest. In: Remote Sensing of Environment. 2003 ; Vol. 85, No. 3. pp. 304-315.
@article{0180e398270b43d2a0c93809a3a9b3c8,
title = "A new parameterization of canopy spectral response to incident solar radiation: Case study with hyperspectral data from pine dominant forest",
abstract = "A small set of independent variables generally seems to suffice when attempting to describe the spectral response of a vegetation canopy to incident solar radiation. This set includes the soil reflectance, the single-scattering albedo, canopy transmittance, reflectance and interception, the portion of uncollided radiation in the total incident radiation, and portions of collided canopy transmittance and interception. All of these are measurable; they satisfy a simple system of equations and constitute a set that fully describes the law of energy conservation in vegetation canopies at any wavelength in the visible and near-infrared part of the solar spectrum. Further, the system of equations specifies the relationship between the optical properties at the leaf and the canopy scales. Thus, the information content of hyperspectral data can be fully exploited if these variables can be retrieved, for they can be more directly related to some of the physical properties of the canopy (e.g. leaf area index). This paper demonstrates this concept through retrievals of single-scattering albedo, canopy absorptance, portions of uncollided and collided canopy transmittance, and interception from hyperspectral data collected during a field campaign in Ruokolahti, Finland, June 14–21, 2000. The retrieved variables are then used to estimate canopy leaf area index, vegetation ground cover, and also the ratio of direct to total incident solar radiation at blue, green, red, and near-infrared spectral intervals.",
keywords = "vegetation canopy, parameterization, spectra",
author = "Yujie Wang and Wolfgang Buermann and Pauline Stenberg and Heikki Smolander and Tuomas H{\"a}me and Yuhong Tian and Jiannan Hu and Yuri Knyazikhin and Myneni, {Ranga B.}",
year = "2003",
doi = "10.1016/S0034-4257(03)00009-9",
language = "English",
volume = "85",
pages = "304--315",
journal = "Remote Sensing of Environment",
issn = "0034-4257",
publisher = "Elsevier",
number = "3",

}

A new parameterization of canopy spectral response to incident solar radiation : Case study with hyperspectral data from pine dominant forest. / Wang, Yujie (Corresponding Author); Buermann, Wolfgang; Stenberg, Pauline; Smolander, Heikki; Häme, Tuomas; Tian, Yuhong; Hu, Jiannan; Knyazikhin, Yuri; Myneni, Ranga B.

In: Remote Sensing of Environment, Vol. 85, No. 3, 2003, p. 304-315.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - A new parameterization of canopy spectral response to incident solar radiation

T2 - Case study with hyperspectral data from pine dominant forest

AU - Wang, Yujie

AU - Buermann, Wolfgang

AU - Stenberg, Pauline

AU - Smolander, Heikki

AU - Häme, Tuomas

AU - Tian, Yuhong

AU - Hu, Jiannan

AU - Knyazikhin, Yuri

AU - Myneni, Ranga B.

PY - 2003

Y1 - 2003

N2 - A small set of independent variables generally seems to suffice when attempting to describe the spectral response of a vegetation canopy to incident solar radiation. This set includes the soil reflectance, the single-scattering albedo, canopy transmittance, reflectance and interception, the portion of uncollided radiation in the total incident radiation, and portions of collided canopy transmittance and interception. All of these are measurable; they satisfy a simple system of equations and constitute a set that fully describes the law of energy conservation in vegetation canopies at any wavelength in the visible and near-infrared part of the solar spectrum. Further, the system of equations specifies the relationship between the optical properties at the leaf and the canopy scales. Thus, the information content of hyperspectral data can be fully exploited if these variables can be retrieved, for they can be more directly related to some of the physical properties of the canopy (e.g. leaf area index). This paper demonstrates this concept through retrievals of single-scattering albedo, canopy absorptance, portions of uncollided and collided canopy transmittance, and interception from hyperspectral data collected during a field campaign in Ruokolahti, Finland, June 14–21, 2000. The retrieved variables are then used to estimate canopy leaf area index, vegetation ground cover, and also the ratio of direct to total incident solar radiation at blue, green, red, and near-infrared spectral intervals.

AB - A small set of independent variables generally seems to suffice when attempting to describe the spectral response of a vegetation canopy to incident solar radiation. This set includes the soil reflectance, the single-scattering albedo, canopy transmittance, reflectance and interception, the portion of uncollided radiation in the total incident radiation, and portions of collided canopy transmittance and interception. All of these are measurable; they satisfy a simple system of equations and constitute a set that fully describes the law of energy conservation in vegetation canopies at any wavelength in the visible and near-infrared part of the solar spectrum. Further, the system of equations specifies the relationship between the optical properties at the leaf and the canopy scales. Thus, the information content of hyperspectral data can be fully exploited if these variables can be retrieved, for they can be more directly related to some of the physical properties of the canopy (e.g. leaf area index). This paper demonstrates this concept through retrievals of single-scattering albedo, canopy absorptance, portions of uncollided and collided canopy transmittance, and interception from hyperspectral data collected during a field campaign in Ruokolahti, Finland, June 14–21, 2000. The retrieved variables are then used to estimate canopy leaf area index, vegetation ground cover, and also the ratio of direct to total incident solar radiation at blue, green, red, and near-infrared spectral intervals.

KW - vegetation canopy

KW - parameterization

KW - spectra

U2 - 10.1016/S0034-4257(03)00009-9

DO - 10.1016/S0034-4257(03)00009-9

M3 - Article

VL - 85

SP - 304

EP - 315

JO - Remote Sensing of Environment

JF - Remote Sensing of Environment

SN - 0034-4257

IS - 3

ER -