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Erdas provides an option to stretch the NDVI values from the typical floating point NDVI range (-1 to 1) to 8-bit unsigned integer (0 - 255). This can be handy to reduce file size from floating point to 8-bit unsigned integer (0 - 255) and stretch the values to the full pixel depth of the image. However, it also reduces the sensitivity of the index. You can ...

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