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Type: Journal article
Title: Development of a ground-based polarimetric broadband SAR system for noninvasive ground-truth validation in vegetation monitoring
Author: Zhou, Zheng-Shu
Boerner, Wolfgang-Martin
Sato, Motoyuki
Citation: IEEE Transactions on Geoscience and Remote Sensing, 2004; 42 (9):1803-1810
Publisher: IEEE
Issue Date: 2004
ISSN: 0196-2892
School/Discipline: School of Electrical and Electronic Engineering
Statement of
Zheng-Shu Zhou, W.-M. Boerner and M. Sato
Abstract: We have developed a ground-based polarimetric broadband synthetic aperture radar (SAR) system for noninvasive ground-truth validation in polarimetric SAR remote sensing of terrestrial vegetation cover. This system consists of a vector network analyzer, one dual-polarized antenna, and an antenna positioner. It can be operated in a frequency range from 50 MHz to 20 GHz, with a scanning aperture of 20 m in the horizontal and 1.5 m in the vertical direction. Tests carried out with standard reflectors showed that the polarimetric measurement capabilities of this system are satisfactory. Using the polarimetric ground-based SAR (GB-SAR) system, we carried out measurements on a specific vegetation cover pertinent to the remote sensing of forested regions within Sendai City, consisting of three different kinds of trees common within the Kawauchi Campus of Tohoku University. Measurements were collected in spring, summer, and autumn. Three-dimensional (3-D) polarization-sensitive images were reconstructed from the acquired data. Analysis of the 3-D polarimetric images of each measurement found differences (at times strong differences) among the polarization signatures. There were stronger reflections in all of the HH, VH, VV images in the second (summer) measurement, especially in the VH image, due to the substantial growth of branches and leaves in summer. This ground-truth validation system provided valuable information about the scattering mechanisms of the three trees selected for analysis in different seasons, which can be detected by broadband polarimetric ground-based SAR measurements. The experimental results demonstrate the excellent polarimetric performance of the newly developed SAR imaging system, which should find many useful and immediate applications in noninvasive ground-truth validation of diverse terrestrial vegetation covers.
Description: Copyright © 2004 IEEE
RMID: 0020076525
DOI: 10.1109/TGRS.2004.832248
Appears in Collections:Electrical and Electronic Engineering publications

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