A Method to Analyse Scattered Waves from Pine Trunk and Its Application to Estimate Trunk Diameter Using Jers-1 Sar Data
نویسندگان
چکیده
ABSTRACT. A numerical method was used to analyse the interaction of L-band microwaves with pine (Pinus merkusii) trunk. This method approximated tree trunk as an infinite length of two layers of cylindrical dielectric media. These layers are xylem and heartwood. Horizontal polarisation (transverse magnetic mode) of the scattered wave was derived in order to determine the relationship between tree trunk diameter and backscattering coefficient. The analysis results were confirmed by simulating the scattering problem on trunk using Finite Difference Time Domain (FDTD) method. Both analysis and simulation results were similar. This relationship was used to estimate pine trunk diameters in Saguling forest, west Java, Indonesia from Japanese Earth Resources Satellite (JERS-1) synthetic aperture radar (SAR) data.
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