Abstract
Simulation of scattered wave from tropical forest tree trunk was conducted in order to estimate the relationship between tree trunk diameters and backscattering coefficients. This simulation used Finite Difference Time Domain (FDTD) method. Mode expansion method was employed to analyze backscattering coefficients on tree trunk as absorber media to confirm the simulation result. Both simulation and analysis results are in good agreement. These results were applied successfully to estimate trunk diameters of tengkawang (Dipterocarpaceae) which dominantly distributed in tropical forest in central Borneo, Indonesia. This application results matched well with ground data.
