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ENVI

Export Classes to Vector Layers

Export Classes to Vector Layers

Use the Classification to Vector tool to export selected classes to a vector shapefile.

You can also write a script to perform this step using ENVIClassificationToShapefileTask.

Follow these steps:

  1. From the Toolbox, select Classification > Post Classification > Classification to Vector. The Data Selection dialog appears.
  2. Select an input classification image and perform optional spatial subsetting and masking, then click OK. The Convert Classification to Vector dialog appears.
  3. The Export Classes section contains a list of individual class names that were imported. Optionally choose one of the following from the Output Method drop-down list:
    • Single Vector Layer (default): Create one shapefile that contains all classes.
    • One Vector Layer per Class: Create multiple shapefiles, one per class.
  4. Specify the path and filename for the output shapefile in the Output Vector field. If you selected the One Vector Layer Per Class option in the previous step, ENVI will create multiple shapefiles and will automatically append the class names to the root filename.
  5. Click OK.

If you created one shapefile that contains all classes, that shapefile is added to the Data Manager and Layer Manager, and it appears in the Image window. Double-click the shapefile in the Layer Manager to display the Vector Properties dialog, then assign unique colors and line properties to the individual classes as needed. The following image shows an example of this step for a single shapefile with four classes:

If you right-click on the shapefile in the Layer Manager and select View Attributes, the Attribute Viewer lists individual polygon records for the different classes, organized by the CLASS_ID and CLASS_NAME attributes; for example:

If you created multiple shapefiles (one per class), the results are not added to the Data Manager or Layer Manager. You must open them manually in ENVI. Double-click each shapefile in the Layer Manager to display the Vector Properties dialog, then assign unique colors and line properties to the individual classes.



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