Use np.abs in pansharpen to avoid sign issues #34
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The band average calculation and multiplication with the pan band from the original method assumes we're operating on the DN values, which are all positive. But since we do this on reflectance instead, we need to take absolute values when doing these to avoid issues with signs flipping in the output.
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The band average calculation and multiplication with the pan band from the original method assumes we're operating on the DN values, which are all positive. But since we do this on reflectance instead, we need to take absolute values when doing these to avoid issues with signs flipping in the output.