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I want to calculate a few of vegetation indexes [ example: NDPI (red band-green band)/(red band + green band)] in a model with the GDAL raster calculator but I don't know how put the equation here:For example, NDPI is (red band-green band)/(red band + green band)

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Make the A raster your red band, the B raster your green band.

(A-B)/(A+B). This link covers a how-to using a different index, but the process is the same.

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