I'am trying to generate an NDVI map using ESA's Sentinel-2 training images, which can be found at http://spirit.cnes.fr/take5. I tried using QGIS's raster calculator to create the NDVI image, however quite unsuccessful, as I can't manage to figure out how the bands correspond to the basic NDVI = (NIR - VIS)/(NIR + VIS) formula. Any Python script or other freeware tool would suit me as well. Any help would be appreciated.
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