Seasonal Modelling Of Leaf Optical Properties And Retrieval Of Leaf Chlorophyll Content Across The Canopy Using PROSPECT : POSTER

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Abstract

Seasonal changes in leaf chlorophyll across the canopy vertical profile provide information on ecosystem structure and functioning. However, studies on the retrieval of leaf chlorophyll content (Cab) using radiative transfer models such as PROSPECT across the canopy vertical profile throughout the growing season are lacking. In this regard, we sought to evaluate the performance of the PROSPECT in modeling leaf optical properties and retrieving Cab across the canopy position throughout the growing season. We collected 588 leaf samples from the upper and lower canopies of deciduous stands over three seasons in Bavaria Forest National Park, Germany. PROSPECT input parameters were measured for all the samples, and their respective reflectance spectra were obtained using an ASD FieldSpec-3 Pro FR spectroradiometer coupled with an Integrating Sphere. To retrieve Cab, we inverted the PROSPECT using a look-up-table (LUT) approach. Our results consistently revealed a strong agreement between the measured and PROSPECT simulated reflectance spectra for the lower canopy compared to the upper canopy, especially in the NIR. This observation concurred with the pattern of Cab retrieval accuracies across the canopy i.e. the Cab retrieval accuracy for the lower canopy was consistently higher (NRMSE = 0.1-0.2) when compared to the upper canopy (NRMSE = 0.122 - 0.269) across all seasons. Results of this study demonstrate that although the PROSPECT model provides acceptable inversion of Cab, subtle seasonal variations in leaf biochemistry and morphology across the canopy potentially affect the performance of the model.
Original languageEnglish
Pages1
Number of pages1
Publication statusPublished - 2019
Event11th EARSel SIG imaging spectroscopy workshop 2019 - Brno, Czech Republic
Duration: 6 Feb 20198 Feb 2019
Conference number: 11
http://is.earsel.org/workshop/11-IS-Brno2019/

Workshop

Workshop11th EARSel SIG imaging spectroscopy workshop 2019
CountryCzech Republic
CityBrno
Period6/02/198/02/19
Internet address

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optical property
chlorophyll
canopy
modeling
vertical profile
reflectance
growing season
ecosystem structure
biochemistry
radiative transfer
national park
seasonal variation

Cite this

@conference{afb6b9d730f0485fade3e54a3a8904be,
title = "Seasonal Modelling Of Leaf Optical Properties And Retrieval Of Leaf Chlorophyll Content Across The Canopy Using PROSPECT : POSTER",
abstract = "Seasonal changes in leaf chlorophyll across the canopy vertical profile provide information on ecosystem structure and functioning. However, studies on the retrieval of leaf chlorophyll content (Cab) using radiative transfer models such as PROSPECT across the canopy vertical profile throughout the growing season are lacking. In this regard, we sought to evaluate the performance of the PROSPECT in modeling leaf optical properties and retrieving Cab across the canopy position throughout the growing season. We collected 588 leaf samples from the upper and lower canopies of deciduous stands over three seasons in Bavaria Forest National Park, Germany. PROSPECT input parameters were measured for all the samples, and their respective reflectance spectra were obtained using an ASD FieldSpec-3 Pro FR spectroradiometer coupled with an Integrating Sphere. To retrieve Cab, we inverted the PROSPECT using a look-up-table (LUT) approach. Our results consistently revealed a strong agreement between the measured and PROSPECT simulated reflectance spectra for the lower canopy compared to the upper canopy, especially in the NIR. This observation concurred with the pattern of Cab retrieval accuracies across the canopy i.e. the Cab retrieval accuracy for the lower canopy was consistently higher (NRMSE = 0.1-0.2) when compared to the upper canopy (NRMSE = 0.122 - 0.269) across all seasons. Results of this study demonstrate that although the PROSPECT model provides acceptable inversion of Cab, subtle seasonal variations in leaf biochemistry and morphology across the canopy potentially affect the performance of the model.",
author = "T.W. Gara and R. Darvishzadeh and A.K. Skidmore and Tiejun Wang",
year = "2019",
language = "English",
pages = "1",
note = "11th EARSel SIG imaging spectroscopy workshop 2019 ; Conference date: 06-02-2019 Through 08-02-2019",
url = "http://is.earsel.org/workshop/11-IS-Brno2019/",

}

Gara, TW, Darvishzadeh, R, Skidmore, AK & Wang, T 2019, 'Seasonal Modelling Of Leaf Optical Properties And Retrieval Of Leaf Chlorophyll Content Across The Canopy Using PROSPECT : POSTER' 11th EARSel SIG imaging spectroscopy workshop 2019, Brno, Czech Republic, 6/02/19 - 8/02/19, pp. 1.

Seasonal Modelling Of Leaf Optical Properties And Retrieval Of Leaf Chlorophyll Content Across The Canopy Using PROSPECT : POSTER. / Gara, T.W.; Darvishzadeh, R.; Skidmore, A.K.; Wang, Tiejun.

2019. 1 Abstract from 11th EARSel SIG imaging spectroscopy workshop 2019, Brno, Czech Republic.

Research output: Contribution to conferenceAbstractOther research output

TY - CONF

T1 - Seasonal Modelling Of Leaf Optical Properties And Retrieval Of Leaf Chlorophyll Content Across The Canopy Using PROSPECT : POSTER

AU - Gara, T.W.

AU - Darvishzadeh, R.

AU - Skidmore, A.K.

AU - Wang, Tiejun

PY - 2019

Y1 - 2019

N2 - Seasonal changes in leaf chlorophyll across the canopy vertical profile provide information on ecosystem structure and functioning. However, studies on the retrieval of leaf chlorophyll content (Cab) using radiative transfer models such as PROSPECT across the canopy vertical profile throughout the growing season are lacking. In this regard, we sought to evaluate the performance of the PROSPECT in modeling leaf optical properties and retrieving Cab across the canopy position throughout the growing season. We collected 588 leaf samples from the upper and lower canopies of deciduous stands over three seasons in Bavaria Forest National Park, Germany. PROSPECT input parameters were measured for all the samples, and their respective reflectance spectra were obtained using an ASD FieldSpec-3 Pro FR spectroradiometer coupled with an Integrating Sphere. To retrieve Cab, we inverted the PROSPECT using a look-up-table (LUT) approach. Our results consistently revealed a strong agreement between the measured and PROSPECT simulated reflectance spectra for the lower canopy compared to the upper canopy, especially in the NIR. This observation concurred with the pattern of Cab retrieval accuracies across the canopy i.e. the Cab retrieval accuracy for the lower canopy was consistently higher (NRMSE = 0.1-0.2) when compared to the upper canopy (NRMSE = 0.122 - 0.269) across all seasons. Results of this study demonstrate that although the PROSPECT model provides acceptable inversion of Cab, subtle seasonal variations in leaf biochemistry and morphology across the canopy potentially affect the performance of the model.

AB - Seasonal changes in leaf chlorophyll across the canopy vertical profile provide information on ecosystem structure and functioning. However, studies on the retrieval of leaf chlorophyll content (Cab) using radiative transfer models such as PROSPECT across the canopy vertical profile throughout the growing season are lacking. In this regard, we sought to evaluate the performance of the PROSPECT in modeling leaf optical properties and retrieving Cab across the canopy position throughout the growing season. We collected 588 leaf samples from the upper and lower canopies of deciduous stands over three seasons in Bavaria Forest National Park, Germany. PROSPECT input parameters were measured for all the samples, and their respective reflectance spectra were obtained using an ASD FieldSpec-3 Pro FR spectroradiometer coupled with an Integrating Sphere. To retrieve Cab, we inverted the PROSPECT using a look-up-table (LUT) approach. Our results consistently revealed a strong agreement between the measured and PROSPECT simulated reflectance spectra for the lower canopy compared to the upper canopy, especially in the NIR. This observation concurred with the pattern of Cab retrieval accuracies across the canopy i.e. the Cab retrieval accuracy for the lower canopy was consistently higher (NRMSE = 0.1-0.2) when compared to the upper canopy (NRMSE = 0.122 - 0.269) across all seasons. Results of this study demonstrate that although the PROSPECT model provides acceptable inversion of Cab, subtle seasonal variations in leaf biochemistry and morphology across the canopy potentially affect the performance of the model.

UR - https://www.conftool.net/EARSeL-WS-IS-2019-Brno/sessions.php

M3 - Abstract

SP - 1

ER -