Leaf area index retrieved from thermal hyperspectral data: commission VII, WG VII/3

Elnaz Neinavaz*, Andrew K. Skidmore, Roshanak Darvishzadeh, Thomas A. Groen

*Corresponding author for this work

Research output: Contribution to journalConference paperpeer-review

1 Citation (Scopus)
45 Downloads (Pure)

Abstract

Leaf area index (LAI) is an important essential biodiversity variable due to its role in many terrestrial ecosystem processes such as evapotranspiration, energy balance, and gas exchanges as well as plant growth potential. A novel approach presented here is the retrieval of LAI using thermal infrared (8-14 μm, TIR) measurements. Here, we evaluate LAI retrieval using TIR hyperspectral data. Canopy emissivity spectral measurements were recorded under controlled laboratory conditions using a MIDAC (M4401-F) illuminator Fourier Transform Infrared spectrometer for two plant species during which LAI was destructively measured. The accuracy of retrieval for LAI was then assessed using partial least square regression (PLSR) and narrow band index calculated in the form of normalized difference index from all possible combinations of wavebands. The obtained accuracy from the PLSR for LAI retrieval was relatively higher than narrow-band vegetation index (0.54<R2<0.74). The results demonstrated that LAI may successfully be estimated from hyperspectral thermal data. The study highlights the potential of hyperspectral thermal data for retrieval of vegetation biophysical variables at the canopy level for the first time.

Original languageEnglish
Pages (from-to)99-105
Number of pages7
JournalThe International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
VolumeXLI-B7
DOIs
Publication statusPublished - 2016
Externally publishedYes
EventXXIII ISPRS Congress - Prague, Czech Republic
Duration: 12 Jul 201619 Jul 2016
Conference number: 23rd

Bibliographical note

Copyright the Author(s) 2016. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

Keywords

  • Thermal
  • Emissivity spectra
  • Leaf area index (LAI)
  • Canopy
  • Remote sensing
  • Spectrometer

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