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Is it possible to pansharpen Landsat 7 RGB band combination (without NIR) to have approximately the same intensities as the original RGB image with gdal_pansharpen.py (weighted Brovey algorithm)? What is the best way to determine the coefficients?

For example, for Landsat 8 I can achieve such a result after setting weight coefficients from here:

gdal_pansharpen.py -w 0.52 -w 0.25 -w 0.23 panchromatic.tif rgb.tif result.tif

Landsat 7 wavelengths

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