THE EXAMINATION OF ALOS PALSAR BACKSCATTER FOR TROPICAL FOREST CLASSIFICATION AND BIOMAS ESTIMATION

I Nengah Surati Jaya1),  Syaiful Daulay2), Mukalil2), Ayub Wosiri2), M Buce Saleh1), Lilik B Prasetyo 1) , Shigeru Ono3), Yoshio Away4), Masanobu Shimada5) and  Kiyono Yoshiyuki6)

Affiliation: 1) Faculty of Forestry IPB, Campus IPB Darmaga, Bogor, Indonesia. E-mail: ins-jaya@cbn.net.id 2) Graduate School of Bogor Agrucultural University; 3) Japan International Cooperation Agency of Jakarta office; 4) Gifu University, Japan 5) JAXA , Japan; 6) Forestry and Forest Product Research Institute of Japan (FFPRI)

Will be prensented by Prof. Nengah in ICSS-2012, Bali  12 January2012

Abstract:

This  study examined the relationship between backscatter magnitude of ALOS PALSAR images having several spatial resolutions (6.25 m, 12.5 m and 50 m) and variation of vegetation and forest variables.  The study was performed in secondary natural forest, Eucalyptus plantation forest, rubber plantation and oil palm estate crop in North Sumatera Province.   The study was focused to  examine several stand and/or plantation variables  that affect the variation of backscatter provided. The stand variables examined includes crown diameter, crown height,  crown density, crown closure, stand density, tree diameter,basal area tree height, leaf area index, tree biomass for every size of tree (sapling, pole and tree levels).   The main purpose of this study was to identify the most significant factors that affect the magnitude of backscatter within each type of forest cover and to develop biomass estimator model using backscatter derived from ALOS PALSAR.  The study found that the variation of forest or vegetation variables may affect the variation of backscatter.  For secondary natural forest, the study found that the stand variables giving significant influences on backscatter variations is the biomass volume and basal areas either for resolution 50 m x 50 m or 6.25 m x 6.25 m.  However, for the Eucalyptus grandis plantation forest, the magnitude of bacskcatter is strongly influenced by stand height for resolution 50 m x 50 m; and stand density and crown closure for resolution 6.25m x 6.25m. For  rubber plantation, the value of backscatter is strongly influenced by basal area tree diameter size  (similar to natural  forest) for resolution 50 m x 50 m; and by biomass, crown area, dbh and tree spacing ratio for 12.5 m x 12.5 m. .  The value of backscatter  in oil palm is  influenced by crown diameter for resolution 50 m x 50 m and by tree height for 12.5 x 12.5 m.      The study also found that bacscatter of ALOS PALSAR can be used to estimate the biomass content of rubber and oil palm.

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