Estimation of tree height and aboveground biomass of coniferous forests in North China using stereo ZY-3, multispectral Sentinel-2, and DEM data

The forest tree height and aboveground biomass (AGB) are important indicators for monitoring changes and trends in forest carbon storage and terrestrial carbon fluxes. Accurate large-scale wall-to-wall mapping of the forest tree height and AGB remain challenging due to the limited data availability...

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Autores principales:	Yueting Wang, Xiaoli Zhang, Zhengqi Guo
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	ZY-3 stereo imagery Sentinel-2 Forest tree height Aboveground biomass Random forest Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/29e391ce2667452e9cfb4d2bb53f4b28
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spelling	oai:doaj.org-article:29e391ce2667452e9cfb4d2bb53f4b282021-12-01T04:50:23ZEstimation of tree height and aboveground biomass of coniferous forests in North China using stereo ZY-3, multispectral Sentinel-2, and DEM data1470-160X10.1016/j.ecolind.2021.107645https://doaj.org/article/29e391ce2667452e9cfb4d2bb53f4b282021-07-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X21003101https://doaj.org/toc/1470-160XThe forest tree height and aboveground biomass (AGB) are important indicators for monitoring changes and trends in forest carbon storage and terrestrial carbon fluxes. Accurate large-scale wall-to-wall mapping of the forest tree height and AGB remain challenging due to the limited data availability for extraction tree height and the data signal saturation problem in AGB estimation. In this study, we explored the potential of forest tree height mapping using stereo imageries, and analyzed whether accounting for such information, in addition to optical sensor data, could improve the performance of AGB estimations of coniferous forests in a case study in North China. First, a spatially continuous tree height product was obtained using Ziyuan-3 satellite (ZY-3) stereo images combined with a digital elevation model (DEM) obtained from Advanced Land Observing Satellite (ALOS) data. Second, two AGB estimation models were established by combining the forest tree height with vegetation index, spectral, biophysical (from Sentinel-2 images), and topographic variables. A random forest algorithm was utilized to evaluate the effect of including the tree height variable in the AGB estimation. The results showed that the tree height estimation using the nadir and forward views of the ZY-3 stereo images was more accurate than that based on the nadir and backward views from the same images. The AGB estimation model incorporating the tree height variable with a coefficient of determination value of 0.7789, a root mean square error (RMSE) value of 29.815 Mg/ha and a relative RMSE of 23.42% was more robust and effective, thereby demonstrating that the tree height variable can be used to alleviate the data signal saturation issue successfully. The proposed approach can provide new insight into forest tree height mapping and AGB products obtained from satellite stereo images and freely accessible Sentinel-2 multispectral images.Yueting WangXiaoli ZhangZhengqi GuoElsevierarticleZY-3 stereo imagerySentinel-2Forest tree heightAboveground biomassRandom forestEcologyQH540-549.5ENEcological Indicators, Vol 126, Iss , Pp 107645- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	ZY-3 stereo imagery Sentinel-2 Forest tree height Aboveground biomass Random forest Ecology QH540-549.5
spellingShingle	ZY-3 stereo imagery Sentinel-2 Forest tree height Aboveground biomass Random forest Ecology QH540-549.5 Yueting Wang Xiaoli Zhang Zhengqi Guo Estimation of tree height and aboveground biomass of coniferous forests in North China using stereo ZY-3, multispectral Sentinel-2, and DEM data
description	The forest tree height and aboveground biomass (AGB) are important indicators for monitoring changes and trends in forest carbon storage and terrestrial carbon fluxes. Accurate large-scale wall-to-wall mapping of the forest tree height and AGB remain challenging due to the limited data availability for extraction tree height and the data signal saturation problem in AGB estimation. In this study, we explored the potential of forest tree height mapping using stereo imageries, and analyzed whether accounting for such information, in addition to optical sensor data, could improve the performance of AGB estimations of coniferous forests in a case study in North China. First, a spatially continuous tree height product was obtained using Ziyuan-3 satellite (ZY-3) stereo images combined with a digital elevation model (DEM) obtained from Advanced Land Observing Satellite (ALOS) data. Second, two AGB estimation models were established by combining the forest tree height with vegetation index, spectral, biophysical (from Sentinel-2 images), and topographic variables. A random forest algorithm was utilized to evaluate the effect of including the tree height variable in the AGB estimation. The results showed that the tree height estimation using the nadir and forward views of the ZY-3 stereo images was more accurate than that based on the nadir and backward views from the same images. The AGB estimation model incorporating the tree height variable with a coefficient of determination value of 0.7789, a root mean square error (RMSE) value of 29.815 Mg/ha and a relative RMSE of 23.42% was more robust and effective, thereby demonstrating that the tree height variable can be used to alleviate the data signal saturation issue successfully. The proposed approach can provide new insight into forest tree height mapping and AGB products obtained from satellite stereo images and freely accessible Sentinel-2 multispectral images.
format	article
author	Yueting Wang Xiaoli Zhang Zhengqi Guo
author_facet	Yueting Wang Xiaoli Zhang Zhengqi Guo
author_sort	Yueting Wang
title	Estimation of tree height and aboveground biomass of coniferous forests in North China using stereo ZY-3, multispectral Sentinel-2, and DEM data
title_short	Estimation of tree height and aboveground biomass of coniferous forests in North China using stereo ZY-3, multispectral Sentinel-2, and DEM data
title_full	Estimation of tree height and aboveground biomass of coniferous forests in North China using stereo ZY-3, multispectral Sentinel-2, and DEM data
title_fullStr	Estimation of tree height and aboveground biomass of coniferous forests in North China using stereo ZY-3, multispectral Sentinel-2, and DEM data
title_full_unstemmed	Estimation of tree height and aboveground biomass of coniferous forests in North China using stereo ZY-3, multispectral Sentinel-2, and DEM data
title_sort	estimation of tree height and aboveground biomass of coniferous forests in north china using stereo zy-3, multispectral sentinel-2, and dem data
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/29e391ce2667452e9cfb4d2bb53f4b28
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Estimation of tree height and aboveground biomass of coniferous forests in North China using stereo ZY-3, multispectral Sentinel-2, and DEM data

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