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In ENVI go to "Band math" and tape: float(b1)/0.0001 look at http://www.exelisvis.fr/docs/BandMath.html , Actually there is no need for this, the reason why values ​​are multiplied by 0.0001 is only for size decreasing of files. Classification adopted by MODIS is [0.2 to 0] =Water, [0 to 0.2]=No vegetation,sand, spare vegetation ... [0.2 to 1]= Vegetation , ...

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