Research Papers

Backscattering characteristics of L-band polarimetric and optical satellite imagery over planted acacia forests in Sumatra, Indonesia

[+] Author Affiliations
Shoko Kobayashi, Kazadi Sanga-Ngoie

Ritsumeikan Asia Pacific University, Graduate School of Asia Pacific Studies, 1-1 Jumonjiibaru, Beppu, Oita 874-8577, Japan

Ragil Widyorini

University of Gadjah Mada, Faculty of Forestry, Jl. Agro no. 1, Bulaksumur, Yogyakarta 55281, Indonesia

Shuichi Kawai, Yoshiharu Omura

Kyoto University, Research Institute for Sustainable Humanosphere, Uji, Kyoto 611-0011, Japan

Bambang Supriadi

PT Musi Hutan Persada, Research and Development, Jl. Raya PT. TEL Desa Tebat Agung, Kec. Rambang Dangku Kab, Muara Enim, Sumatera Selatan 31172, Indonesia

J. Appl. Remote Sens. 6(1), 063525 (Mar 21, 2012). doi:10.1117/1.JRS.6.063525
History: Received October 29, 2010; Revised January 20, 2012; Accepted January 25, 2012
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Abstract.  Backscattering characteristics of L-band synthetic aperture radar (SAR) polarization data over industrial plantation forests of the fast-growing Acacia mangium in Sumatra, Indonesia, were investigated by combined analysis of microwave and optical reflectance imagery acquired by the Advanced Land Observation Satellite (ALOS) and ground observation data of forest stand characteristics. Prior to the satellite data analysis, growth curves of the planted trees are analyzed using ground observation data. The results show that tree growth fits a sigmoidal curve with a maximum growth rate between 1 and 2 years of age, which gradually declines after that. Our statistical analyses using satellite and ground observation data provide the following findings: 1. The regression between SAR backscattering intensity and forest stand characteristics fits negative quadratic curves for the cross-polarization HV, which show higher correlation than those obtained for the co-polarizations (HH, VV); 2. A decreasing trend in optical normalized difference vegetation index (NDVI) values with age prevails for the trees 2 years and older; 3. A significant correlation is obtained between SAR backscattering and NDVI for the cross-polarization. These findings suggest that the L-band SAR cross-polarization is strongly affected by the acacia tree foliage.

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© 2012 Society of Photo-Optical Instrumentation Engineers

Citation

Shoko Kobayashi ; Ragil Widyorini ; Shuichi Kawai ; Yoshiharu Omura ; Kazadi Sanga-Ngoie, et al.
"Backscattering characteristics of L-band polarimetric and optical satellite imagery over planted acacia forests in Sumatra, Indonesia", J. Appl. Remote Sens. 6(1), 063525 (Mar 21, 2012). ; http://dx.doi.org/10.1117/1.JRS.6.063525


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