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Journal of Applied Remote Sensing

Optimizing spectral resolutions for the classification of C3 and C4 grass species, using wavelengths of known absorption features
Author(s): Clement Adjorlolo; Onisimo Mutanga; Riyad Ismail; Moses A. Cho
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Paper Abstract

Hyperspectral remote-sensing approaches are suitable for detection of the differences in 3-carbon (C3 /sub> and four carbon (C<sub>4) grass species phenology and composition. However, the application of hyperspectral sensors to vegetation has been hampered by high-dimensionality, spectral redundancy, and multicollinearity problems. In this experiment, resampling of hyperspectral data to wider wavelength intervals, around a few band-centers, sensitive to the biophysical and biochemical properties of C3 or C4 grass species is proposed. The approach accounts for an inherent property of vegetation spectral response: the asymmetrical nature of the inter-band correlations between a waveband and its shorter- and longer-wavelength neighbors. It involves constructing a curve of weighting threshold of correlation (Pearson's r ) between a chosen band-center and its neighbors, as a function of wavelength. In addition, data were resampled to some multispectral sensors-ASTER, GeoEye-1, IKONOS, QuickBird, RapidEye, SPOT 5, and WorldView-2 satellites-for comparative purposes, with the proposed method. The resulting datasets were analyzed, using the random forest algorithm. The proposed resampling method achieved improved classification accuracy (κ=0.82 ), compared to the resampled multispectral datasets (κ=0.78, 0.65, 0.62, 0.59, 0.65, 0.62, 0.76, respectively). Overall, results from this study demonstrated that spectral resolutions for C3 and C4 grasses can be optimized and controlled for high dimensionality and multicollinearity problems, yet yielding high classification accuracies. The findings also provide a sound basis for programming wavebands for future sensors.

Paper Details

Date Published: 4 September 2012
PDF: 15 pages
J. Appl. Rem. Sens. 6(1) 063560 doi: 10.1117/1.JRS.6.063560
Published in: Journal of Applied Remote Sensing Volume 6, Issue 1
Show Author Affiliations
Clement Adjorlolo, Univ. of KwaZulu-Natal (South Africa)
Onisimo Mutanga, Univ. of KwaZulu-Natal (South Africa)
Riyad Ismail, Univ. of KwaZulu-Natal (South Africa)
Moses A. Cho, International Institute for Geo-Information Science and Earth Observation (Netherlands)

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