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**Minimum Distance (1) — the formula.** For a pixel with measurement vector **V** and class **m** mean vector **B_m**: $$ D_{\text{ist}}(\text{class}_m) \;=\; \sqrt{\sum_{k=1}^{n} (B_{m,k} - V_k)^2} $$ - Euclidean distance across all *n* bands. - The pixel is assigned to the class whose **distance is smallest** (closest mean). Source: ERDAS Field Guide 2002 p. 232.

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