Recode is a post-classification tool that reassigns class values in a thematic raster. You enter the classified image, then renumber the New Value column to merge or rename classes (e.g., collapse three forest subclasses into one “Forest” class).

• Use after a classification run to simplify the final map.
• Available in ERDAS Imagine under Raster → Thematic → Recode (older: Interpreter → GIS Analysis → Recode).