Use Execute Existing Decision Tree to execute an existing decision tree file. You can change the input bands and edit the output parameters.

1. From the Toolbox, select Classification > Decision Tree > Execute Decision Tree. The Enter Saved Decision Tree Filename dialog appears.
2. Select the decision tree file to execute and click Open. The Variable/File Pairings dialog appears.
3. Assign the variables to files by selecting the variable name and selecting a file.
4. Click OK. The Decision Tree Execution Parameters dialog appears.
5. To spatially subset your data, click Spatial Subset.
6. Select output to File or Memory. If your data are georeferenced, also select which image to use as a base image, enter an output pixel size, and select the resampling method from the drop-down list.
7. Click OK. ENVI adds the resulting output to the Layer Manager.