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Proceedings Paper

Comparison of the performances of middle-resolution multi-spectral images for vegetation cover rate extraction based on mixture analyses
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Paper Abstract

This study aims to establish a practical image analysis method for the use of middle-scale resolution images acquired by the multi-spectral sensors such as Landsat-7/ETM+, Terra/ASTER and ALOS/AVNIR-2 as the complementary data sources of higher resolution images such as Quickbird for the purpose of environmental monitoring of wide-range areas. For this purpose, an image analysis based on mixture is investigated as one of the effective approaches. As the information target, we selected vegetation cover rate (VCR) in urban area because it is one of the important environmental factors to affect urban environment issue such as heat island phenomena. In order to realize easy and efficient computation for estimating the mixture rate of vegetation categories, the linear mixture model using two main categories including vegetation and non-vegetation, is applied in combination with the least square estimation of multi-regressive coefficients for vegetation cover rate (VCR) and non-vegetation cover rate (non-VCR) with several bands data by multi-spectral sensors. In addition, two sub-categories for both of vegetation and non-vegetation categories are considered to specify representative pixel values as correct as possible, that is, trees and grasses for vegetation, and buildings and bare-soils for non-vegetation respectively, and their optical mixture rates are estimated as well as the mixture rate of vegetation and non-vegetation categories. For this purpose, an iterative procedure is adopted, in which each mixture rate of two sub-categories for vegetation and non-vegetation is varied by ten percent steps and the least square estimation is applied with all combinations of mixture rates of sub-categories for vegetation and non-vegetation. The experiments for VCR extraction were conducted in the test site of Hiroshima-city and by using multi-spectral data acquired by Landsat-7/ETM+, Terra/ASTER, and ALOS/AVNIR-2. The accuracy for VCR extraction was evaluated based on the comparison with the VCRs obtained by means of pixel-wise vegetation/non-vegetation classification of a Quickbird multi-spectral image. The result shows that the number of bands is one of the important parameters in general. However, it was verified that the combination of wavelength regions is more important than the number of bands. The result of this study suggests that the combination of wavelength regions is essential in middle-resolution multi-spectral images for vegetation cover rate estimation based on mixture analyses.

Paper Details

Date Published: 29 October 2007
PDF: 9 pages
Proc. SPIE 6749, Remote Sensing for Environmental Monitoring, GIS Applications, and Geology VII, 67491R (29 October 2007); doi: 10.1117/12.736607
Show Author Affiliations
Yuzo Suga, Hiroshima Institute of Technology (Japan)
Tomohisa Konishi, Computer Aided Design & Information Ctr. (Japan)
Shoji Takeuchi, Hiroshima Institute of Technology (Japan)

Published in SPIE Proceedings Vol. 6749:
Remote Sensing for Environmental Monitoring, GIS Applications, and Geology VII
Manfred Ehlers; Ulrich Michel, Editor(s)

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