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**USGS EarthExplorer** — the free browser for Landsat (and many other USGS/NASA) imagery. - URL: **https://earthexplorer.usgs.gov** - Workflow: choose **Search Criteria** (address/coords/WRS path+row/date range) → choose **Data Sets** (e.g., *Landsat Collection 2 Level-2*) → **Results** → download. - You need a free USGS account to download full scenes. - Other sources: **Copernicus Browser** (Sentinel-2), **Google Earth Engine** (for massive time-series analysis).

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