mc
short answer
essay
Prompt
[MANDATORY] Recode — what it does and when it's used.
Plain English answer (default view) — what you'd actually write on the test
After classification, your image often has **more spectral classes than meaningful ones**. Recode lets you collapse them. Example: ISODATA finds 30 clusters. You inspect them and realize 5 are all just different shades of forest, 4 are all urban, 3 are all water. Use **Recode** to merge them down to a handful of real classes — Forest, Urban, Water, Crop — for a clean final map. Cleanup tool. Always used **after** classification, never before.
🔬 Technical version / model bullets (revealed on click) — one bullet per line
Post-classification tool that reassigns class values in a thematic raster. Renumber the **New Value** column to merge or rename classes (e.g., 3 forest subclasses → 1 Forest class). Runs **after** a classification to simplify the final map. In ERDAS Imagine: Raster → Thematic → Recode.
💡 Mnemonic / memory aid (shown on hover)
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