Evaluation of Landsat-7 ETM+ Panchromatic Band for Image Fusion with Multispectral Bands |
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| Authors: | Liu Jian Guo |
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| Institution: | (1) School of mechanical engineering, Xi’an Jiaotong University, Xi’an, Shaanxi, 710049, People’s Republic of China |
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| Abstract: | The Landsat-7 ETM+ panchromatic band is taken simultaneously with multispectral bands using the same sensor system. The two data sets, therefore, are coregistered accurately and the solar illumination and other environmental conditions are identical. This makes ETM+ Pan advantageous to SPOT Pan for resolution fusion. A spectral preserve image fusion technique, Smoothing Filter-Based Intensity Modulation (SFIM), can produce optimal fusion data without altering the spectral properties of the original image if the coregistration error is minimal. With TM/SPOT Pan fusion, the technique is superior to HSI and Brovey transform fusion techniques in spectral fidelity, but has slightly degraded edge sharpness as a result of TM/SPOT Pan coregistration error because SFIM is sensitive to coregistration accuracy and temporal changes of edges. The problem is self-resolved for ETM+ because there is virtually no coregistration error between the panchromatic band and the multispectral bands. Quality fusion imagery data thus can be produced. |
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| Keywords: | ETM+ fusion spectral preserve spatial improvement |
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