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Automated Spectral Hourglass

Automated Spectral Hourglass

Use the Automated Spectral Hourglass to run the Spectral Hourglass Wizard from a single screen without any intermediate interaction. The steps include MNF, PPI, automatic endmember prediction from the n-D Visualizer, and SAM, MTMF, and Linear Spectral Unmixing mapping methods. Specify the parameters required for these functions in the Automated Hourglass Parameters dialog; each step runs without your interaction.

Note: You should not use the Automated Spectral Hourglass unless you are familiar with the Spectral Hourglass Wizard processing flow and appropriate parameters. You achieve better results if you run the Spectral Hourglass Wizard and interactively select your parameters and endmembers.

  1. From the Toolbox, select Spectral > Spectral Unmixing > Automated Spectral Hourglass. The Automated Hourglass Processing Input Files dialog appears.
  2. Select the input file and perform optional spatial and spectral subsetting, and/or masking, then click OK. The Automated Hourglass Parameters dialog appears with default values for the parameters. See Spectral Hourglass Wizard for descriptions of these parameters.
  3. Edit the parameters or accept the defaults.
  4. Click OK. The Spectral Hourglass Wizard processing flow runs.
  5. ENVI adds output from all of the intermediate steps to the Layer Manager, spectral libraries, and plot windows, so that you can investigate each step for accuracy. ROIs containing the pixels used in the mapping methods are output, and the mean spectra used as endmembers are output to a text file and spectral library.

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