USGS EarthExplorer
earthexplorer.usgs.gov
The US Geological Survey's search and download portal for satellite imagery such as Landsat, plus aerial photographs, elevation data and other Earth observation datasets.
Why it is useful
A free route to real satellite and aerial imagery, including historical coverage that lets you compare a place across decades. It requires a free account to download, and it is geared towards people who work with geospatial data.
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