Effects of Plant Crown Shape on Microwave Backscattering Coefficients of Vegetation Canopy

A microwave scattering model is a powerful tool for determining relationships between vegetation parameters and backscattering characteristics. The crown shape of the vegetation canopy is an important parameter in forestry and affects the microwave scattering modeling results. However, there are few...

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Autores principales:	Xiangchen Liu, Yun Shao, Long Liu, Kun Li, Jingyuan Wang, Shuo Li, Jinning Wang, Xuexiao Wu
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	crown shape microwave backscattering coefficients Tor Vergata Model computational electromagnetics Chemical technology TP1-1185
Acceso en línea:	https://doaj.org/article/b5065e1558a3485c87c1cbc7c285a1d9
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spelling	oai:doaj.org-article:b5065e1558a3485c87c1cbc7c285a1d92021-11-25T18:58:59ZEffects of Plant Crown Shape on Microwave Backscattering Coefficients of Vegetation Canopy10.3390/s212277481424-8220https://doaj.org/article/b5065e1558a3485c87c1cbc7c285a1d92021-11-01T00:00:00Zhttps://www.mdpi.com/1424-8220/21/22/7748https://doaj.org/toc/1424-8220A microwave scattering model is a powerful tool for determining relationships between vegetation parameters and backscattering characteristics. The crown shape of the vegetation canopy is an important parameter in forestry and affects the microwave scattering modeling results. However, there are few numerical models or methods to describe the relationships between crown shapes and backscattering features. Using the Modified Tor Vergata Model (MTVM), a microwave scattering model based on the Matrix Doubling Algorithm (MDA), we quantitatively characterized the effects of crown shape on the microwave backscattering coefficients of the vegetation canopy. FEKO was also used as a computational electromagnetic method to make a complement and comparison with MTVM. In a preliminary experiment, the backscattering coefficients of two ideal vegetation canopies with four representative crown shapes (cylinder, cone, inverted cone and ellipsoid) were simulated: MTVM simulations were performed for the L (1.2 GHz), C (5.3 GHz) and X (9.6 GHz) bands in fully polarimetric mode, and FEKO simulations were carried out for the C (5.3 GHz) band at VV and VH polarization. The simulation results show that, for specific input parameters, the mean relative differences in backscattering coefficients due to variations in crown shape are as high as 127%, which demonstrates that the crown shape has a non-negligible influence on microwave backscattering coefficients of the vegetation canopy. In turn, this also suggests that investigation on effects of plant crown shape on microwave backscattering coefficients may have the potential to improve the accuracy of vegetation microwave scattering models, especially in canopies where volume scattering is the predominant mechanism.Xiangchen LiuYun ShaoLong LiuKun LiJingyuan WangShuo LiJinning WangXuexiao WuMDPI AGarticlecrown shapemicrowave backscattering coefficientsTor Vergata Modelcomputational electromagneticsChemical technologyTP1-1185ENSensors, Vol 21, Iss 7748, p 7748 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	crown shape microwave backscattering coefficients Tor Vergata Model computational electromagnetics Chemical technology TP1-1185
spellingShingle	crown shape microwave backscattering coefficients Tor Vergata Model computational electromagnetics Chemical technology TP1-1185 Xiangchen Liu Yun Shao Long Liu Kun Li Jingyuan Wang Shuo Li Jinning Wang Xuexiao Wu Effects of Plant Crown Shape on Microwave Backscattering Coefficients of Vegetation Canopy
description	A microwave scattering model is a powerful tool for determining relationships between vegetation parameters and backscattering characteristics. The crown shape of the vegetation canopy is an important parameter in forestry and affects the microwave scattering modeling results. However, there are few numerical models or methods to describe the relationships between crown shapes and backscattering features. Using the Modified Tor Vergata Model (MTVM), a microwave scattering model based on the Matrix Doubling Algorithm (MDA), we quantitatively characterized the effects of crown shape on the microwave backscattering coefficients of the vegetation canopy. FEKO was also used as a computational electromagnetic method to make a complement and comparison with MTVM. In a preliminary experiment, the backscattering coefficients of two ideal vegetation canopies with four representative crown shapes (cylinder, cone, inverted cone and ellipsoid) were simulated: MTVM simulations were performed for the L (1.2 GHz), C (5.3 GHz) and X (9.6 GHz) bands in fully polarimetric mode, and FEKO simulations were carried out for the C (5.3 GHz) band at VV and VH polarization. The simulation results show that, for specific input parameters, the mean relative differences in backscattering coefficients due to variations in crown shape are as high as 127%, which demonstrates that the crown shape has a non-negligible influence on microwave backscattering coefficients of the vegetation canopy. In turn, this also suggests that investigation on effects of plant crown shape on microwave backscattering coefficients may have the potential to improve the accuracy of vegetation microwave scattering models, especially in canopies where volume scattering is the predominant mechanism.
format	article
author	Xiangchen Liu Yun Shao Long Liu Kun Li Jingyuan Wang Shuo Li Jinning Wang Xuexiao Wu
author_facet	Xiangchen Liu Yun Shao Long Liu Kun Li Jingyuan Wang Shuo Li Jinning Wang Xuexiao Wu
author_sort	Xiangchen Liu
title	Effects of Plant Crown Shape on Microwave Backscattering Coefficients of Vegetation Canopy
title_short	Effects of Plant Crown Shape on Microwave Backscattering Coefficients of Vegetation Canopy
title_full	Effects of Plant Crown Shape on Microwave Backscattering Coefficients of Vegetation Canopy
title_fullStr	Effects of Plant Crown Shape on Microwave Backscattering Coefficients of Vegetation Canopy
title_full_unstemmed	Effects of Plant Crown Shape on Microwave Backscattering Coefficients of Vegetation Canopy
title_sort	effects of plant crown shape on microwave backscattering coefficients of vegetation canopy
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/b5065e1558a3485c87c1cbc7c285a1d9
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_version_	1718410484856651776

Effects of Plant Crown Shape on Microwave Backscattering Coefficients of Vegetation Canopy

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