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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SISEF-Italian Society of Silviculture and Forest Ecology
2017
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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 |
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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 |
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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 |