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**World Reference System (WRS).** The Path/Row grid. - **WRS-1** — used by Landsat 1–3 (18-day cycle, 251 paths). - **WRS-2** — used by Landsat 4–9 (16-day cycle, **233 paths**, 248 rows). Canonical grid for all modern Landsat products. - WRS makes it possible to cite any place on Earth with a single integer pair and retrieve a consistent scene from any Landsat mission.

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