Some time ago Twitter user OSINT_Research (https://twitter.com/OSINT_Research) shared a link to the website of Spectator (https://twitter.com/spectatorearth), that features a range of tools for satellite imagery. It has easy access to freely available imagery by Sentinel and Landsat, and they even provide API access in case you want to automatically monitor an area. And don’t think that it only features imagery in natural colour, because if you need an NVDI filter, or specific bands, that too is available.
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Posted by: @ESPYER.