How do I rescale NDVI values that are 0-255 to -1;1?
I'm trying to do it in ArcGIS Desktop.
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Using the raster calculator, you'll want to rescale your NDVI image. The formula you'll want to use is:
NDVI = 2/255*image-1
This is simply the linear regression between 0 to 255 and -1 to 1, applied to raster math.