Scaling PRI between coniferous canopy structures

Matti Mottus, Miina Rautiainen

Research output: Contribution to journalArticleScientificpeer-review

10 Citations (Scopus)

Abstract

We measured simultaneously the spectral albedo of ten Scots pine shoots and the needles constituting the shoots. Next, we used the spectral information to calculate the photochemical reflectance index (PRI) which allows to retrieve photosynthetic productivity from imaging spectroscopy data. We showed that PRI can be scaled from needle to shoot level using a strictly positive scaling factor. The scaling factor is a function of photon recollision probability and the harmonic mean of needle spectral albedos at the wavelengths used in the index. The method is applicable to other normalized difference indices, as demonstrated here using normalized difference vegetation index (NDVI). At shoot level, both PRI and NDVI depend on the angle between view and illumination directions. This anisotropy, however, is not a direct function of scattering angle.

Original languageEnglish
Article number6494342
Pages (from-to)708-714
Number of pages7
JournalIEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Volume6
Issue number2
DOIs
Publication statusPublished - 9 Apr 2013
MoE publication typeA1 Journal article-refereed

Fingerprint

Needles
reflectance
canopy
shoot
NDVI
albedo
Anisotropy
Photons
Lighting
Productivity
Spectroscopy
Scattering
Imaging techniques
Wavelength
anisotropy
spectroscopy
scattering
index
wavelength
productivity

Keywords

  • Photochemical reflectance index
  • photon recollision probability
  • Pinus sylvestris
  • Scots pine
  • shoot scattering
  • vegetation structure

Cite this

@article{f24c25bcda794f88ac0bc52f439c50f6,
title = "Scaling PRI between coniferous canopy structures",
abstract = "We measured simultaneously the spectral albedo of ten Scots pine shoots and the needles constituting the shoots. Next, we used the spectral information to calculate the photochemical reflectance index (PRI) which allows to retrieve photosynthetic productivity from imaging spectroscopy data. We showed that PRI can be scaled from needle to shoot level using a strictly positive scaling factor. The scaling factor is a function of photon recollision probability and the harmonic mean of needle spectral albedos at the wavelengths used in the index. The method is applicable to other normalized difference indices, as demonstrated here using normalized difference vegetation index (NDVI). At shoot level, both PRI and NDVI depend on the angle between view and illumination directions. This anisotropy, however, is not a direct function of scattering angle.",
keywords = "Photochemical reflectance index, photon recollision probability, Pinus sylvestris, Scots pine, shoot scattering, vegetation structure",
author = "Matti Mottus and Miina Rautiainen",
year = "2013",
month = "4",
day = "9",
doi = "10.1109/JSTARS.2013.2253307",
language = "English",
volume = "6",
pages = "708--714",
journal = "IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing",
issn = "1939-1404",
publisher = "Institute of Electrical and Electronic Engineers IEEE",
number = "2",

}

Scaling PRI between coniferous canopy structures. / Mottus, Matti; Rautiainen, Miina.

In: IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, Vol. 6, No. 2, 6494342, 09.04.2013, p. 708-714.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Scaling PRI between coniferous canopy structures

AU - Mottus, Matti

AU - Rautiainen, Miina

PY - 2013/4/9

Y1 - 2013/4/9

N2 - We measured simultaneously the spectral albedo of ten Scots pine shoots and the needles constituting the shoots. Next, we used the spectral information to calculate the photochemical reflectance index (PRI) which allows to retrieve photosynthetic productivity from imaging spectroscopy data. We showed that PRI can be scaled from needle to shoot level using a strictly positive scaling factor. The scaling factor is a function of photon recollision probability and the harmonic mean of needle spectral albedos at the wavelengths used in the index. The method is applicable to other normalized difference indices, as demonstrated here using normalized difference vegetation index (NDVI). At shoot level, both PRI and NDVI depend on the angle between view and illumination directions. This anisotropy, however, is not a direct function of scattering angle.

AB - We measured simultaneously the spectral albedo of ten Scots pine shoots and the needles constituting the shoots. Next, we used the spectral information to calculate the photochemical reflectance index (PRI) which allows to retrieve photosynthetic productivity from imaging spectroscopy data. We showed that PRI can be scaled from needle to shoot level using a strictly positive scaling factor. The scaling factor is a function of photon recollision probability and the harmonic mean of needle spectral albedos at the wavelengths used in the index. The method is applicable to other normalized difference indices, as demonstrated here using normalized difference vegetation index (NDVI). At shoot level, both PRI and NDVI depend on the angle between view and illumination directions. This anisotropy, however, is not a direct function of scattering angle.

KW - Photochemical reflectance index

KW - photon recollision probability

KW - Pinus sylvestris

KW - Scots pine

KW - shoot scattering

KW - vegetation structure

UR - http://www.scopus.com/inward/record.url?scp=84877923073&partnerID=8YFLogxK

U2 - 10.1109/JSTARS.2013.2253307

DO - 10.1109/JSTARS.2013.2253307

M3 - Article

AN - SCOPUS:84877923073

VL - 6

SP - 708

EP - 714

JO - IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing

JF - IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing

SN - 1939-1404

IS - 2

M1 - 6494342

ER -