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NDVI accuracy - doubt


A_M

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Hi!

I have a doubt related with NDVI images. How make accuracy from a NDVI difference image? How to create an error matrix with the classes "increase", "decrease" and "no change"? I created train sites in the right places but now I don't know how to create an error matrix on ENVI 4 or ArcGIS (if it is possible).

In ENVI 4, Classification > Post-Classification > Confusion Matrix > Using Ground Truth ROIs, ENVI 4 tells that need a Classification Image and my NDVI difference image doesn't fill this requirement.

What can I do?

With ArcGIS this can be made too? And with GDAL?

Thanks a lot!!

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In ENVI 4, Classification > Post-Classification > Confusion Matrix > Using Ground Truth ROIs, ENVI 4 tells that need a Classification Image and my NDVI difference image doesn't fill this requirement.

-> that gives me an error because is a NDVI image and doesn't have classification (I think is because of that...)

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