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I've created a signature file with 8 clusters and performed an unsupervised classification in ArcGIS 9.3. Later I have grouped values (spatial) classes together to form 4 classes I needed (in symbology) but that just "colors" them the same, they're still treated as separate categories. I need to merge them to have only 4 groups/categories.

What to do?

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Take a look at the Reclassify tool. Alternately you can do the reclassification from the Spatial Analyst toolbar.

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