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A confusion matrix contains information about actual and predicted classifications done by a classification system.
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vote
Doing Accuracy Assessment using test data from shapefile in ENVI?
You can/must convert your .shp file to ROI in ENVI. Go to vector > convert vector to ROI and select your shapefiles.
Check this video for converting to ROI
https://www.youtube.com/watch?v=ukrgGUkxJlU …