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L-band synthetic aperture radar (SAR) response to the tropical forest stands for carbon stock assessment

Several attempts have been made to obtain forest stand parameters such as stand volume, stand density, basal area, biomass, and carbon stock from synthetic aperture radar (SAR) data. However the relationship between these parameters and radar backscatter has been a challenging issue since the last f...

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Main Authors: Omar, Hamdan, Che Mat, Nur Laila, Hamzah, Khali Aziz, Ismail, Mohd Hasmadi
Format: Conference or Workshop Item
Language:English
Published: AIP Publishing LLC 2012
Online Access:http://psasir.upm.edu.my/id/eprint/57595/1/L-band%20synthetic%20aperture%20radar%20%28SAR%29%20response%20to%20the%20tropical%20forest%20stands%20for%20carbon%20stock%20assessment.pdf
http://psasir.upm.edu.my/id/eprint/57595/
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spelling my.upm.eprints.575952017-10-24T06:22:08Z http://psasir.upm.edu.my/id/eprint/57595/ L-band synthetic aperture radar (SAR) response to the tropical forest stands for carbon stock assessment Omar, Hamdan Che Mat, Nur Laila Hamzah, Khali Aziz Ismail, Mohd Hasmadi Several attempts have been made to obtain forest stand parameters such as stand volume, stand density, basal area, biomass, and carbon stock from synthetic aperture radar (SAR) data. However the relationship between these parameters and radar backscatter has been a challenging issue since the last few years. In this study, L-band ALOS PALSAR satellite image with a spatial resolution of 12.5 m was utilized to identify the most ideal relationship between radar backscatter and aboveground carbon stock (ACS) atdifferent strata of tropical forest stands. The Forest Research Institute Malaysia (FRIM) campus which has about 420 ha of forest area was selected as the study area. Field survey was conducted in which ten (10) test plots (50 × 50 m, 0.25 ha) were established and all trees with the diameter at breast height (dbh) of 5 cm and above were inventoried. The calculated plot-based ACS was divided into six diameter classes - which is defined as strata - ofthe trees within the plot, which are i) 5 cm and above, ii) 10 cm and above, iii) 15 cm and above, iv) 20 cm and above, v) 25 cm and above, and vi) 30 cm and above. The total ACS of each class was correlated to the pixels of SAR backscatter corresponding to the plot location on the ground. Results showed that the forest was sensitive to the backscatter on horizontal-vertical polarized (HV) image as compared with horizontal-horizontal polarized (HH) image and a combination of both HH and HV polarizations. However, only ACS that was calculated based on diameter class of 15 cm and above gave the strongest correlation to the SAR signal. The signals also tend to saturate when carbon stock starts to increase from 180 t ha−1 at around −8 dB. The experiment from the study suggested that only mature trees (i.e. of diameter more than 15 cm) with sufficient canopy height can be included in inventory to obtain accurate carbon stock estimation when using satellite based L-band SAR data. AIP Publishing LLC 2012 Conference or Workshop Item PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/57595/1/L-band%20synthetic%20aperture%20radar%20%28SAR%29%20response%20to%20the%20tropical%20forest%20stands%20for%20carbon%20stock%20assessment.pdf Omar, Hamdan and Che Mat, Nur Laila and Hamzah, Khali Aziz and Ismail, Mohd Hasmadi (2012) L-band synthetic aperture radar (SAR) response to the tropical forest stands for carbon stock assessment. In: 2012 National Physics Conference (PERFIK 2012), 19-21 Nov. 2012, Colmar Tropicale, Bukit Tinggi, Pahang, Malaysia. (pp. 76-81). 10.1063/1.4803572
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
description Several attempts have been made to obtain forest stand parameters such as stand volume, stand density, basal area, biomass, and carbon stock from synthetic aperture radar (SAR) data. However the relationship between these parameters and radar backscatter has been a challenging issue since the last few years. In this study, L-band ALOS PALSAR satellite image with a spatial resolution of 12.5 m was utilized to identify the most ideal relationship between radar backscatter and aboveground carbon stock (ACS) atdifferent strata of tropical forest stands. The Forest Research Institute Malaysia (FRIM) campus which has about 420 ha of forest area was selected as the study area. Field survey was conducted in which ten (10) test plots (50 × 50 m, 0.25 ha) were established and all trees with the diameter at breast height (dbh) of 5 cm and above were inventoried. The calculated plot-based ACS was divided into six diameter classes - which is defined as strata - ofthe trees within the plot, which are i) 5 cm and above, ii) 10 cm and above, iii) 15 cm and above, iv) 20 cm and above, v) 25 cm and above, and vi) 30 cm and above. The total ACS of each class was correlated to the pixels of SAR backscatter corresponding to the plot location on the ground. Results showed that the forest was sensitive to the backscatter on horizontal-vertical polarized (HV) image as compared with horizontal-horizontal polarized (HH) image and a combination of both HH and HV polarizations. However, only ACS that was calculated based on diameter class of 15 cm and above gave the strongest correlation to the SAR signal. The signals also tend to saturate when carbon stock starts to increase from 180 t ha−1 at around −8 dB. The experiment from the study suggested that only mature trees (i.e. of diameter more than 15 cm) with sufficient canopy height can be included in inventory to obtain accurate carbon stock estimation when using satellite based L-band SAR data.
format Conference or Workshop Item
author Omar, Hamdan
Che Mat, Nur Laila
Hamzah, Khali Aziz
Ismail, Mohd Hasmadi
spellingShingle Omar, Hamdan
Che Mat, Nur Laila
Hamzah, Khali Aziz
Ismail, Mohd Hasmadi
L-band synthetic aperture radar (SAR) response to the tropical forest stands for carbon stock assessment
author_facet Omar, Hamdan
Che Mat, Nur Laila
Hamzah, Khali Aziz
Ismail, Mohd Hasmadi
author_sort Omar, Hamdan
title L-band synthetic aperture radar (SAR) response to the tropical forest stands for carbon stock assessment
title_short L-band synthetic aperture radar (SAR) response to the tropical forest stands for carbon stock assessment
title_full L-band synthetic aperture radar (SAR) response to the tropical forest stands for carbon stock assessment
title_fullStr L-band synthetic aperture radar (SAR) response to the tropical forest stands for carbon stock assessment
title_full_unstemmed L-band synthetic aperture radar (SAR) response to the tropical forest stands for carbon stock assessment
title_sort l-band synthetic aperture radar (sar) response to the tropical forest stands for carbon stock assessment
publisher AIP Publishing LLC
publishDate 2012
url http://psasir.upm.edu.my/id/eprint/57595/1/L-band%20synthetic%20aperture%20radar%20%28SAR%29%20response%20to%20the%20tropical%20forest%20stands%20for%20carbon%20stock%20assessment.pdf
http://psasir.upm.edu.my/id/eprint/57595/
_version_ 1643836534241099776
score 13.211869

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