Estimation of Leaf Area Index from Hyperspectral Thermal Data : powerpoint

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Estimation of Leaf Area Index from

Hyperspectral Thermal Data

EARSeL, Luxembourg, 14-16 April 2015

Elnaz Neinavaz

Roshanak Darvishzadeh Andrew Skidmore

Thomas Groen Christoph Hecker

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Context of this research:

0,4 0,6 0,8 1,0 1,4 _2,0 _3,0 _6,0 VIS NIR LWIR SWIR _MWIR 8,0…

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To evaluate the

effects of variation of LAI on emissivity of plants.

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Euonymus japonicus

Ficus benjamina

Buxus sempervirens Azalea japonica

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 MIDAC (M4401-F)

• Wavelength from 2.5 to 20 (μm) • Spectral resolution of 32 to 0.5

(cm-1)_.

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Radiance spectra of the gold diffuse

plate

Radiance spectra of the sample

surface

Radiance spectra of hot and cold

blackbodies Emissivity spectra Data processing Radiometric calibration Emissivity derivation Pre-preprocessing of spectra

Methodology:

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Azalea japonica

Euonymus japonicus

Primary results:

 Correlation between emissivity and leaf area index

Buxus sempervirens Ficus benjamina Buxus sempervirens Max Max Max Max

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Results:

Influence of same amount of LAI on emissivity in different species

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LAI 2.5 (m

2

_m

-2

₎

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 The emissivity spectra changes with LAI variation;  Emissivity spectra demonstrates differences

between species with similar LAI from 8-14 µm of the spectrum;

 Hyperspectral data at the TIR region has the potential for retrieval of vegetation biophysical variables.

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Thank you for your attention!

E., Neinavaz, R., Darvishzadeh, A.K., Skidmore, T., Groen and C., Hecker.