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ENVI

Select SAM Parameters

Select SAM Parameters

The Select SAM Maximum Angle Threshold panel represents step 5 in the workflow. Here, you can specify the maximum angle threshold for the Spectral Angle Mapper (SAM) analysis. Decreasing the threshold usually results in fewer matching pixels (better matches to the reference spectrum). Increasing the threshold may result in a more spatially coherent image; however, the overall pixel matches will not be as good as for the lower threshold.

  1. Modify the SAM Maximum Angle value as needed. The default value is 0.10 radians. The increase/decrease buttons increment the value by 0.05 radians.
  2. Click Next in the Wizard. A processing status dialog shows the progress of the SAM analysis, and the Investigate SAM Results panel appears.



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