The layers here are satellite imagery. Mapping sites definitely bring in any other sources that make sense though.
I haven't looked at it a great deal, the "Premium" layer appears to be more carefully produced with the "Standard" layer favoring fresher imagery. So both are nice resources.
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DigitalGlobe has multiple satellites with ~30cm pixels.
https://en.wikipedia.org/wiki/WorldView-4
The layers here are satellite imagery. Mapping sites definitely bring in any other sources that make sense though.
I haven't looked at it a great deal, the "Premium" layer appears to be more carefully produced with the "Standard" layer favoring fresher imagery. So both are nice resources.