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**Panchromatic imaging.** A **single** wide-band channel — the sensor is sensitive to radiation across a broad wavelength range. - When that range coincides with the **visible spectrum**, the image resembles a **black-and-white photograph**. - **Advantages:** high spatial resolution (no band splits), good geometric accuracy — basis of pan-sharpening workflows. - **Examples:** Landsat 8/9 Band 8 (15 m pan), SPOT HRV pan (10 m), IKONOS pan (1 m).

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