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**Pushbroom (linear) vs. whiskbroom (scanning) — why pushbroom is superior.** - **No moving mirror** → more reliable, longer mission life. - **Longer dwell time per pixel** → higher signal-to-noise, stronger signal. - **CCDs are smaller, lighter, lower-power** than the optics a scanning mirror needs. - **Disadvantage of pushbroom:** calibrating **thousands of detectors** to produce a uniform radiometric response is difficult (each CCD has slightly different gain/offset) — a given scanner with one detector never has this problem.

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