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**Off-nadir viewing (SPOT HRV).** - Each HRV's viewing mirror can be commanded from the ground to tilt up to **±27°** off vertical. - **Advantage 1 — stereoscopic imagery.** Two images of the same ground target from different angles produce parallax, which lets you derive elevation (DEMs, 3D models). - **Advantage 2 — shorter revisit.** At mid-latitudes, the effective revisit drops from the 26-day nadir cycle to **1–4 (5) days**.

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