TY - JOUR
T1 - Factor analysis approach for composited ASTER band ratios and wavelet transform pixel-level image fusion
T2 - Lithological mapping of the Neoproterozoic Wadi Kid area, Sinai, Egypt
AU - Gad, Sabreen
AU - Raef, Abdelmoneam
PY - 2012/2
Y1 - 2012/2
N2 - In this study, we have adopted an approach for objective optimization of the selection of band ratios in forming Advanced Space-borne Thermal Emission and Reflection Radiometer (ASTER) band ratio composites, based on factor analysis loadings and specific variances. The factor loadings and specific variances of all 72 possible spectral band ratios of the visible and near infrared (VNIR) and the short-wave infrared (SWIR) of ASTER data from Wadi Kid, southeastern Sinai Peninsula, Egypt, were utilized to construct two separate rankings of band ratios in an ascending manner in order to determine the best ASTER band ratio combinations for lithological mapping in the study area. Two ASTER band ratio composites ((band 6/band 3-band 1/band 3-band 9/band 5) and (8/6-8/7-4/7) in blue-green-red (BGR)) were built, based on the rankings of factor loadings and specific variances, respectively. These two composites were fused together based on a discrete wavelet transform (DWT) decomposition, which enables decomposition of an image into (high-pass) details and (low-pass) approximations at various levels of resolution, resulting in improved lithological discrimination of granitic and meta-sediments rock units and a reduction in the BGR imprints of topographic reliefs.
AB - In this study, we have adopted an approach for objective optimization of the selection of band ratios in forming Advanced Space-borne Thermal Emission and Reflection Radiometer (ASTER) band ratio composites, based on factor analysis loadings and specific variances. The factor loadings and specific variances of all 72 possible spectral band ratios of the visible and near infrared (VNIR) and the short-wave infrared (SWIR) of ASTER data from Wadi Kid, southeastern Sinai Peninsula, Egypt, were utilized to construct two separate rankings of band ratios in an ascending manner in order to determine the best ASTER band ratio combinations for lithological mapping in the study area. Two ASTER band ratio composites ((band 6/band 3-band 1/band 3-band 9/band 5) and (8/6-8/7-4/7) in blue-green-red (BGR)) were built, based on the rankings of factor loadings and specific variances, respectively. These two composites were fused together based on a discrete wavelet transform (DWT) decomposition, which enables decomposition of an image into (high-pass) details and (low-pass) approximations at various levels of resolution, resulting in improved lithological discrimination of granitic and meta-sediments rock units and a reduction in the BGR imprints of topographic reliefs.
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U2 - 10.1080/01431161.2011.577106
DO - 10.1080/01431161.2011.577106
M3 - Article
AN - SCOPUS:84857927609
SN - 0143-1161
VL - 33
SP - 1488
EP - 1506
JO - International Journal of Remote Sensing
JF - International Journal of Remote Sensing
IS - 5
ER -