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Select Bands for Intelligent Digitizer

Select Bands for Intelligent Digitizer

To start Intelligent Digitizer, you select a single band or multiple bands from your image. If your image has only three bands and you want to use multiple bands for linear extraction, ENVI automatically selects all three bands as your input bands.

Select a Single Band


  1. From the Toolbox, select Vector > Intelligent Digitizer. The Intelligent Digitizer Input File dialog appears.
  2. Click the Select By toggle button to select Band.
  3. Select the input band.
  4. Click OK. The image band opens in a display group and the Vector Parameters dialog appears with a layer named Intelligent Digitizer: New Layer in the Available Vector Layers list.
  5. Extract features.

You can also select a single band by following the steps in the next section and select only a single band instead of multiple bands.

Select Multiple Bands


Selecting multiple bands differs depending on whether you access Intelligent Digitizer from the display group or from the Toolbox.

If you are starting Intelligent Digitizer from the Toolbox:

  1. Select Vector > Intelligent Digitizer. The Intelligent Digitizer Input File dialog appears.
  2. Select the input file.
  3. Click OK. If the image has three or fewer bands, the image opens in color in a display group and the Vector Parameters dialog appears with a layer named Intelligent Digitizer: New Layer in the Available Vector Layers list. Proceed to the steps in Using Intelligent Digitizer.
  4. If the image has more than three bands, the File Spectral Subset dialog appears with pre-selected bands. ENVI pre-selects bands as follows:
    • If the image has four bands, ENVI selects bands 3 and 4, typically the red and near-infrared bands.
    • If the image has more than four bands and also has wavelength information, ENVI selects a color-infrared combination of bands.
    • If the image has more than four bands but does not have wavelength information, ENVI selects the bands as [nb/3, nb/2, nb*2/3] for red, green, and blue, where nb is number of bands.
  5. Select the band, or bands, to use for linear extraction, or keep the default band selection. If you want to use multiple bands, it is recommended that you select six or fewer bands. Using more than six bands slows system performance.
  6. Click OK. The image opens in color in a display group and the Vector Parameters dialog appears with a layer named Intelligent Digitizer: New Layer in the Available Vector Layers list.
  7. Extract features.



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