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Seeing trees from space: above-ground biomass estimates of intact and degraded montane rainforests from high-resolution optical imagery

Accurately quantifying the above-ground carbon stock of tropical rainforest trees is the core component of “Reduction of Emissions from Deforestation and Forest Degradation-plus” (REDD+) projects and is important for evaluating the effects of anthropogenic global change. We used high-resolution opti...

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Main Authors: Phua, Mui How, Ling, Zia-Yiing, David Anthony Coomes, Wilson Wong, Alexius Korom, Satoshi Tsuyuki, Keiko Ioki, Yasumasa Hirata, Hideki Saito, Gen Takao
Format: Article
Language:English
English
Published: SISEF-Italian Society of Silviculture and Forest Ecology 2017
Subjects:
QK1-474.5 General Including geographical distribution
SD1-669.5 Forestry
Online Access:https://eprints.ums.edu.my/id/eprint/34060/1/Seeing%20trees%20from%20space.pdf
https://eprints.ums.edu.my/id/eprint/34060/2/Seeing%20trees%20from%20space1.pdf
https://eprints.ums.edu.my/id/eprint/34060/
https://iforest.sisef.org/abstract/?id=ifor2204-010
https://doi.org/10.3832/ifor2204-010
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spelling my.ums.eprints.340602022-08-30T02:43:47Z https://eprints.ums.edu.my/id/eprint/34060/ Seeing trees from space: above-ground biomass estimates of intact and degraded montane rainforests from high-resolution optical imagery Phua, Mui How Ling, Zia-Yiing David Anthony Coomes Wilson Wong Alexius Korom Satoshi Tsuyuki Keiko Ioki Yasumasa Hirata Hideki Saito Gen Takao QK1-474.5 General Including geographical distribution SD1-669.5 Forestry Accurately quantifying the above-ground carbon stock of tropical rainforest trees is the core component of “Reduction of Emissions from Deforestation and Forest Degradation-plus” (REDD+) projects and is important for evaluating the effects of anthropogenic global change. We used high-resolution optical imagery (IKONOS-2) to identify individual tree crowns in intact and degraded rainforests in the mountains of Northern Borneo, comparing our results with 50 ground-based plots dispersed in intact and degraded forests, within which all stems > 10 cm in diameter were measured and identified to species or genus. We used the dimensions of tree crowns detected in the imagery to estimate above-ground biomasses (AGBs) of individual trees and plots. To this purpose, preprocessed IKONOS imagery was segmented using a watershed algorithm; stem diameter values were then estimated from the cross-sectional crown areas of these trees using regression relationships obtained from ground-based measurements. Finally, we calculated the biomass of each tree (AGBT, in kg), and the AGB of plots by summation (AGBP, in Mg ha-1). Remotely sensed estimates of mean AGBT were similar to ground-based estimates in intact and degraded forests, even though small trees could not be detected from space-borne sensors. The intact and degraded forests not only had different AGB but were also dissimilar in biodiversity. A tree-centric approach to carbon mapping based on high-resolution optical imagery, could be a cheap alternative to airborne laser-scanning. SISEF-Italian Society of Silviculture and Forest Ecology 2017 Article PeerReviewed text en https://eprints.ums.edu.my/id/eprint/34060/1/Seeing%20trees%20from%20space.pdf text en https://eprints.ums.edu.my/id/eprint/34060/2/Seeing%20trees%20from%20space1.pdf Phua, Mui How and Ling, Zia-Yiing and David Anthony Coomes and Wilson Wong and Alexius Korom and Satoshi Tsuyuki and Keiko Ioki and Yasumasa Hirata and Hideki Saito and Gen Takao (2017) Seeing trees from space: above-ground biomass estimates of intact and degraded montane rainforests from high-resolution optical imagery. iForest-Biogeosciences and Forestry, 10. pp. 625-634. ISSN 1971-7458 https://iforest.sisef.org/abstract/?id=ifor2204-010 https://doi.org/10.3832/ifor2204-010
institution Universiti Malaysia Sabah
building UMS Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Sabah
content_source UMS Institutional Repository
url_provider http://eprints.ums.edu.my/
language English
English
topic QK1-474.5 General Including geographical distribution
SD1-669.5 Forestry
spellingShingle QK1-474.5 General Including geographical distribution
SD1-669.5 Forestry
Phua, Mui How
Ling, Zia-Yiing
David Anthony Coomes
Wilson Wong
Alexius Korom
Satoshi Tsuyuki
Keiko Ioki
Yasumasa Hirata
Hideki Saito
Gen Takao
Seeing trees from space: above-ground biomass estimates of intact and degraded montane rainforests from high-resolution optical imagery
description Accurately quantifying the above-ground carbon stock of tropical rainforest trees is the core component of “Reduction of Emissions from Deforestation and Forest Degradation-plus” (REDD+) projects and is important for evaluating the effects of anthropogenic global change. We used high-resolution optical imagery (IKONOS-2) to identify individual tree crowns in intact and degraded rainforests in the mountains of Northern Borneo, comparing our results with 50 ground-based plots dispersed in intact and degraded forests, within which all stems > 10 cm in diameter were measured and identified to species or genus. We used the dimensions of tree crowns detected in the imagery to estimate above-ground biomasses (AGBs) of individual trees and plots. To this purpose, preprocessed IKONOS imagery was segmented using a watershed algorithm; stem diameter values were then estimated from the cross-sectional crown areas of these trees using regression relationships obtained from ground-based measurements. Finally, we calculated the biomass of each tree (AGBT, in kg), and the AGB of plots by summation (AGBP, in Mg ha-1). Remotely sensed estimates of mean AGBT were similar to ground-based estimates in intact and degraded forests, even though small trees could not be detected from space-borne sensors. The intact and degraded forests not only had different AGB but were also dissimilar in biodiversity. A tree-centric approach to carbon mapping based on high-resolution optical imagery, could be a cheap alternative to airborne laser-scanning.
format Article
author Phua, Mui How
Ling, Zia-Yiing
David Anthony Coomes
Wilson Wong
Alexius Korom
Satoshi Tsuyuki
Keiko Ioki
Yasumasa Hirata
Hideki Saito
Gen Takao
author_facet Phua, Mui How
Ling, Zia-Yiing
David Anthony Coomes
Wilson Wong
Alexius Korom
Satoshi Tsuyuki
Keiko Ioki
Yasumasa Hirata
Hideki Saito
Gen Takao
author_sort Phua, Mui How
title Seeing trees from space: above-ground biomass estimates of intact and degraded montane rainforests from high-resolution optical imagery
title_short Seeing trees from space: above-ground biomass estimates of intact and degraded montane rainforests from high-resolution optical imagery
title_full Seeing trees from space: above-ground biomass estimates of intact and degraded montane rainforests from high-resolution optical imagery
title_fullStr Seeing trees from space: above-ground biomass estimates of intact and degraded montane rainforests from high-resolution optical imagery
title_full_unstemmed Seeing trees from space: above-ground biomass estimates of intact and degraded montane rainforests from high-resolution optical imagery
title_sort seeing trees from space: above-ground biomass estimates of intact and degraded montane rainforests from high-resolution optical imagery
publisher SISEF-Italian Society of Silviculture and Forest Ecology
publishDate 2017
url https://eprints.ums.edu.my/id/eprint/34060/1/Seeing%20trees%20from%20space.pdf
https://eprints.ums.edu.my/id/eprint/34060/2/Seeing%20trees%20from%20space1.pdf
https://eprints.ums.edu.my/id/eprint/34060/
https://iforest.sisef.org/abstract/?id=ifor2204-010
https://doi.org/10.3832/ifor2204-010
_version_ 1760231244653658112
score 13.211869

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