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Use the NDVI tool to transform multispectral data into a single image band representing vegetation distribution. The NDVI (Normalized Difference Vegetation Index) values indicate the amount of green vegetation present in the pixel. Higher NDVI values indicate more green vegetation. Valid results fall between -1 and +1.

Also see the Spectral Indices tool, which contains NDVI and many other spectral indices.

  1. From the Toolbox, select Spectral > Vegetation > NDVI. The Input File dialog appears.
  2. Select an input file and perform optional spatial subsetting, then click OK. The NDVI Calculation Parameters dialog appears.
  3. ENVI automatically determines the bands needed to calculate NDVI in the Red and Near IR fields. You can enter different bands if needed.

  4. Select output to File or Memory.
  5. Select one of the following output types from the Output Data Type drop-down list.
    • Byte: Enter the Min and Max NDVI value in the fields supplied.
    • Floating Point
  6. Click OK. ENVI adds the resulting output to the Image window and to the Layer Manager.

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