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**Two scanning geometries** used by multispectral sensors, 0.3–14.0 µm: - **Across-track ("whiskbroom")** — a single detector + rotating/oscillating mirror sweeps perpendicular to the flight path. **Examples:** Landsat MSS, TM, ETM+. - **Along-track ("pushbroom")** — a linear array of detectors (one per pixel in the swath) builds the image as the platform moves forward. **Examples:** SPOT HRV/HRVIR, IRS LISS, IKONOS, QuickBird. - **Why pushbroom is better:** longer dwell time per pixel → higher SNR and finer resolution; no moving mirror.

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