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I have layer stacked Landsat 8 image, how can I calculate Normalized difference water index (NDWI) from it?

I would have been able to calculate it easily using the raster calculator, if I had the green and NIR bands individually.

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    $\begingroup$ I'm not sure, but you might not be explaining clearly enough the exact nature of the "stacked Landsat 8 image" that you do have. Landsat 8 does have both green and near infrared channels (bands 3 and 5 respectively); what channels are present in your image(s)? $\endgroup$
    – uhoh
    Feb 23 '20 at 7:11
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    $\begingroup$ the stacked landsat 8 image has bands 1-5 in it. How can the raster calculator use bands 3 and 5 from the stacked image to calculate NDWI? I can do it easily as i mentioned earlier if I had the individual bands. $\endgroup$ Feb 23 '20 at 18:36
  • $\begingroup$ Thanks for the reply. Is your question something like "I have bands 1 and 5 and I want to do a calculation that requires bands 3 and 5, how can I do it?" Is it possible that "you can't" might be the answer? I think that the more details you edit back into the original question (not just in comments) the more likely others can help. I'm no expert on this topic. $\endgroup$
    – uhoh
    Feb 24 '20 at 2:51
  • $\begingroup$ Please indicate which software you are using. $\endgroup$
    – Aaron
    Feb 25 '20 at 11:09
  • $\begingroup$ Something is lost in translation here. Does your file have bands 1 through 5 or 1 and 5. $\endgroup$
    – Gabriel
    Feb 25 '20 at 15:34

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